查询词典 weeds

Because of the exotic weeds with strong reproductive capacity, adaptability and adversity-resistance, and short of strong competitive plants and natural enemies in the local area the exotic weeds such as Aiternanthera philoxeroides, Eichhornia crassipes, Ageratina adenophorun and Ageratum conyzoides etc.

由于农林牧渔业生产、绿化美化等目的有意引进；或旅游、交通工具等无意引入；或自身扩散传播的自然入侵，外来植物一旦逃逸人为控制进入自然生态系统并能自行繁殖和扩散，形成野化种群，变成外来入侵植物，成为危害农牧业生产和破坏生态环境的有害杂草。

The problem of weeds can be regarded as resolved, but new problems may come, every time I remove the weeds, that they will see a black insect flying in Alocasia, at first I did not care, can be subsequently leaves have been eating a hole, I was concerned about the effect of this phenomenon, on the show from home mosquito control agent, spray several times, it really is effective!

杂草的问题算是解决了，可新的问题却又来了，每次我除去杂草的时候，都会看到有黑色的小虫在观音莲上飞，起初我并没有在意，可后来叶子上都被啃出了小洞，我才关注起了这个现象，就从家里拿出灭蚊剂，喷了几次，还真是有效果呢！

There were over 20 species of grass weeds, and over 30 species of broadleaf weeds in 15 families.

结果显示：该市麦田主要禾本科杂草超过20种，主要阔叶杂草有15科30种以上。

Deep plowing before planting alfalfa can effectively prevent the use of horsetail, reeds, weeds such as Convolvulus arvensis hazards, but also advance the adoption of tillage-induced seed germination of weeds, through the laundry and other measures to suppress the emergence of weeds.

苜蓿播种前采用深耕能有效防止问荆、芦苇、田旋花等杂草的危害，通过翻耕还能提早诱发杂草种子的萌发，通过晾晒等措施能抑制杂草的出苗。

Result In peanut seedling stage, spraying 900 ml/hm^2 quizalofop-P-ethyl EC on the grass weeds such as Barnyard grass, Green bristlegrass and Goosegrass had 100% control effect, but it had a poor control effect on some broad-leaved weeds. While, spraying 600 and 720 ml/hm^2 quizalofop-p-ethyllactuofen EC had remarkable effects not only on the grass weeds such as B. grass but also on the broad-leaved weeds such as Purslane, Cirsium setosum and Dayflower, with the control effect of more than 80%. Both of the 2 herbicides would not produce some slight contact drug spots on the part of peanut leaves and the drug spots on the leaves could be recovered in 1 to 2 weeks, which couldn't affect the growth and yield of the peanut in middle and late stage. So the 2 herbicides had good selectivity.

结果］在花生苗期喷施900 ml/hm^2精喹禾灵乳油对稗草、狗尾草、牛筋草等禾本科杂草具有100%的防效，但对一些阔叶杂草防效较差，而喷施600和720 ml/hm^2精喹乳氟禾乳油则除了对稗草等禾本科杂草有特效外，还对马齿苋、刺儿菜、鸭跖草等阔叶杂草具有显著的防效，均达80%以上。2种除草剂均对花生叶片局部产生一些轻度的接触性药斑，药斑在12周内可恢复，不影响花生的中后期生长及产量，具有很强的选择性。

Benzoxazine compounds are one kind of highly active protoporhyrinogen oxidase inhibitors. These compounds can effectively control both monocotyledon weeds and dicotyledon weeds at lower dosage. The action mechanism is similar to p-nitro-o-substituted diphenylethers. They can result weeds albinism and decolorization, which are very important albinism herbicide.

苯并噁嗪类化合物是一类高活性的原卟啉原氧化酶抑制剂，低剂量可有效地防除禾本科与阔叶杂草，其作用机理和对硝基邻位取代的二苯醚类似，它们造成白化或脱色，是白化除草剂中较重要的种类，其活性远超过二苯醚除草剂，是目前化学农药研究领域的热点。

The xeromorph weeds are the most damage weeds to rice during the first fastigium,while the water weeds are dorminant types in the second fastigium.

近些年北方地区常年出现季节性干旱，导致水稻生产不稳定，有些年份个别地区甚至导致水田弃耕。

The distribution and harm of species of dominant weeds of lawn vary with different area, and the most harmful weeds belong 8 families, which were Poaceae, Asteraceae, Cyperaceae , Amaranthaceae, Euphorbiaceae, Polygonaceae, Fabaceae and Caryophyllaceae, about accounted for from sixty percent to seventy percent in all weeds in lawn.

摘要不同地区草坪优势杂草的种类不尽相同，禾本科、菊科、莎草科、苋科、大戟科、蓼科、豆科和石竹科等8个科的杂草种类和发生数量最多，约占杂草总数的60%~70%。

Using nuclear DNA C-values for 539 angiosperms in China, we examined the variation of these values among growth forms and taxonomic groups and the relationship of these values with invasiveness. Mean DNA C-value of the 539 angiosperm species was 4.06 pg. Mean DNA C-value was(1) significantly lower for woody species (1.84 pg) than for herbaceous species(5.02 pg);(2) significantly lower for 360 dicots (2.20 pg) than for 179 monocots (7.80 pg);(3) significantly lower for annuals (2.78 pg) than for perennials(6.65 pg);(4) significantly lower for 134 weed species (1.93 pg) than for herbaceous non-weeds (6.75 pg) and for several families that have an unusually high proportion of weed species;(5) significantly lower for 47 exotic weed species (1.76 pg) than for 134 native weeds (1.93 pg), but significantly lower than that of "non-weedy" herbaceous species (6.75 pg);(6) lower for weeds than for "non-weedy" species in same genus or family; and (7) in herbaceous species, generally lower for weedy compared to "non-weedy" species, with some exceptions such as Avena fatua, whose DNA C-value is as high as 14.15 pg, contrarily, and some "non-weedy" herbaceous species in Cruciferae and Cucurbitaceae with very low values.

统计了中国境内有分布的539种被子植物的DNA C-值，分析了它们在不同分类群、生活型、倍性、生活史类型以及在杂草和非杂草类群中的分布情况，主要结果如下：(1)539种被子植物DNA C-值平均为4.06 pg，其中木本植物的DNA C-值平均为1.84 pg，低于草本植物的平均值(5.02 pg)；(2)双子叶植物(360种)的DNA C-值平均为2.20 pg，极明显地小于单子叶植物(179种)的平均值(7.80 pg)；(3)1年生植物的DNA C-值平均为2.78 pg，明显小于多年植物的平均DNA C-值(6.65 pg)；(4)134种杂草的DNA C-值平均为1.93 pg，明显小于非杂草草本植物的平均值(6.75 pg)，含杂草较多的科，平均DNA C-值相对较小；(5)统计的47种入侵杂草的DNA C-值平均为1.76 pg，略小于134种杂草的平均DNA C-值(1.93 pg)，极显著地小于非杂草性草本植物(6.75 pg)；(6)以科为单位，不同科的DNA C-值存在着极大的差异；(7)DNA C-值与染色体倍性的关系并不明显，但是，随着倍性的增加，基因组变小；(8)在同一科、属中，与非杂草相比，典型杂草的DNA C-值往往偏小；(9)总体上杂草或杂草性强的植物，它们的DNA C-值比非杂草性植物的要小。

Tepraloxydim can kill Gramineae weeds effectively, and it can be applied to all the weeds' generational period especially in 3-5 leaf periods in Gramineae weeds.

快捕净对禾本科杂草有较好的杀草活性，可以适用于杂草的整个生育期，在禾本科杂草的3-5叶期使用效果最好。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。