查询词典 present-day

Corona present at base of perianth in one to several series of showy filaments; innermost series membranous, partially to entirely fused, margin entire or fimbriate, often incurved over nectar chamber; extra-staminal nectariferous disk present around base of androgynophore, fused to base of hypanthium.

副花冠宿存在基部为一到数轮艳丽的花丝；最内部轮膜质，部分完全愈合，边缘全缘或流苏状，在花蜜的寝室上方通常弯曲的；在雌雄蕊柄的基部周围的特别雄蕊的分泌蜜汁的花盘宿存，对托杯的基部愈合。

But the effluent ammonium in the anoxic reactor, where enough NO2 present were present, was equal to the blank system, and no ammonium was converted to such nitrogen compounds as NO-2 and N2 by Nitrosomonas eutropha using NO2 as electron acceptor, which maybe caused by lack of the function bacteria.

但在足够NO2存在并且缺氧的条件下，单级自养脱氮系统内的出水氨氮浓度与空白反应器相当，NH+4并没有被亚硝化单胞菌以NO2为电子受体氧化为NO-2和N2等化合物而得以去除，可能是因为系统内不存在该类型的亚硝化功能菌。

Females will clump and allopreen males in nonbreeding plumage if a red male is not present, but may act aggressive towards other females and brown males if a red male is present.

女性将丛和allopreen男性在nonbreeding羽毛，如果一个红色的男性是不存在，但可能的侵略行为，对其他女性和男性的布朗，如果一个红色的男性是目前的。

Therefore, whenever patients present with severe, recurrent blisters on their palms and soles, especially in elderly patients present with severe, recurrent blisters on their palms and soles, especially in elderly patients with hemorrhagic lesions, dyshidrosiform pemphigoid should be considered.

因此，当病患在手掌及脚底出现严重、常常复发的水泡，特别是在老年人而且病灶主要是以出血性的形式来表现者，异汗样类天疱疮这个疾病应列入考虑。

In this paper,the present status of the Polycarboxylic superplasticizer research at home and abroad,the present status of three different synthesises research,action mechanism were introduced in detail.

介绍了聚羧酸系高性能效减水剂国内外研究现状、目前3种不同合成方法的研究现状及优缺点、作用机理的研究，提出一些亟待深入研究的问题及聚羧酸系高性能减水剂今后的研究方向。

BACKGROUND: At present, studies show that a kind of stem cell community which in many kinds of organizations can differentiate into tissue cells of different embryonic layers; but those are different from embryonic stem cells, embryonic stem cell will lose the part differentiation potential gradually during the development of pregnancy, and will present some special phenotypes or the molecular markers, as CD105 and so on, will call it postembryonic pluripotent stem cells.

背景：目前研究认为在胚胎发育后的多种组织中存在一类干细胞群体，可分化为不同胚层的组织细胞；但又不同于胚胎干细胞，随着妊娠期间胚胎的发育胚胎干细胞会逐渐失去部分分化潜能，会出现一些特殊表型或分子标记，如CD105，称其为胚胎后亚全能干细胞。

This thesis discourses upon the restriction of verbs in their tense, aspect and type when present participle phrases are used as postpositional attributive in English and compares semantic distinctions between the present participle phrases and attributive clauses.

现在分词短语用作名词的后置定语是一种十分常见的语法现象，它与中心名词构成逻辑主谓关系，有限制性和非限制性两种用法，分别相当于限制性定语从句和非限制性定语从句。

Here, we took demonstration study of the ecological impacts of disconnection from the river on fish recources in Zhangdu Lake. Our results showed that:(1) Fishery mode changed and the rate of wild fishery production changed from 95% in 1949 to less than 5% in 2002.(2) Fish species have decreased from 80 in 1950s to 52 at present, and the rate of migrant and potamic species decreased from 50% in 1950s to 30% at present.

我们以涨渡湖为例开展江湖阻隔后对单个湖泊鱼类资源所产生的生态影响进行研究，结果表明：江湖阻隔导致湖泊生产经营方式改变，使得野生渔业产量的比例由1949年的95%，降低到2002年的不足5%；江湖阻隔后湖泊鱼类种类由50年代约80种下降到现在的52种，其中，洄游性和流水型鱼类比重由50%下降至不足30

Here, we took demonstration study of the ecological impacts of disconnection from the river on fish recources in Zhangdu Lake. Our results showed that:(1) Fishery mode changed and the rate of wild fishery production changed from 95% in 1949 to less than 5% in 2002.(2) Fish species have decreased from 80 in 1950s to 52 at present, and the rate of migrant and potamic species decreased from 50% in 1950s to 30% at present.(3) Comparing with the linking lake, Zhangdu Lake had higher fishing production, larger individual size, fewer species number and lower diversity index of "mihunzheng" fishery, a universal fishing tool in Yangtze.

我们以涨渡湖为例开展江湖阻隔后对单个湖泊鱼类资源所产生的生态影响进行研究，结果表明：江湖阻隔导致湖泊生产经营方式改变，使得野生渔业产量的比例由1949年的95%，降低到2002年的不足5%；江湖阻隔后湖泊鱼类种类由50年代约80种下降到现在的52种，其中，洄游性和流水型鱼类比重由50%下降至不足30%；迷魂阵渔获物在单位产量、个体大小上极显著(p 0.01)地高于通江湖泊，但在物种数和多样性指数上则要低得多(p 0.01)。

It is divided into three chapters. First chapter will describe the procreant background and the present condition of Gigabit Ethernet network. After that, this part will continue to present the sixth copper cable composing Ethernet bit network in detail from these three aspects: design, construction and testing. Especially, it also analyzes the main testing parameters of Gigabit Ethernet network and possible reasons of influencing testing results.

本文第一章首先探讨了千兆网络的产生的背景和现状，然后从六类铜缆千兆网络的设计、施工和测试三个方面，对于这种新型的网络作了较为详细的阐述，并着重分析了六类铜缆千兆网络的主要测试参数及影响测试结果的原因。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。