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According to the changes of plasm components and cell structure,the development process of SE in secondary phloem could be divided into three stages,ie immature,mature and degenerated stages.

根据筛管细胞结构和原生质组分的系列变化，可将筛管发育过程划分为未成熟期、成熟期和衰退期。

With the results of monitoring the spatial patterns of cotton aphid populations in various stages, there are distinct spatial heterogeneity in the distribution of cotton aphid under large and small scales in different stages.

通过对大尺度和小尺度下不同阶段的棉蚜变异函数模型的拟合，得出大尺度和小尺度棉蚜空间分布在棉蚜种群不同发生阶段具有空间异质性，研究区域内，小尺度下棉蚜种群的空间异质性格局中平均有77.6%是由棉蚜种群内部的空间自相关造成的，而大尺度下这个比例达85%。

The results indicated that the SS expression in sweet sorghum leaves and stems was lower at early growth stages, increased dramatically at late growth stages (flowering, grain filling, and dough stage), and reached the highest level at flowering stage.

结果表明，甜高粱叶片和茎秆中的SS蛋白质表达量在发育早期较低，发育后期（开花期、灌浆期和腊熟期）明显升高，在开花期最高。

In the earlier stages the distance between the foetal and placental blood is approximately 140 microns but in the later stages is reduced to 2-3microns.

在妊娠早期，胎儿和胎盘血管之间的距离大概只有140微米，但是在后期只有大概2-3微米。

In this century, our Department of the forest cover to 22%, should be in stages and at different stages to achieve the region.

在本世纪处使我国的森林覆盖率达到22%，应分期分阶段和分不同地区来实现。

According to Goos's and Galbraith's model of problem solving (1996), only one interviewee had the features of all three stages. This student also demonstrated a better understanding of how to transfer newly gained knowledge to weather forecast exercises. The other four interviewees, who did not have the features of all stages, need teachers' facilitation to build their problem-solving skills in order to make optimal learning using the instructional simulation developed by this study.

根据Gooth and Galbraith（1996）的三阶段解题模式分析晤谈资料，发现只有一位受访者具备所有解题阶段的特徵，此位首访者亦展示如何将所学应用到新的学习情境，（Reno的及时天气预报），其他四位受访者则需要教师的协助，来发展解题技能，才可能受益於「气流过山与成云降水模拟」所设计的学习环境。

A flowsheet consists of three stages of fine grindings,two stages of gravity separations and a screening process was adopted to recover iron from iron-smelting slag ,and reduced iron powder with MFe exceeding 90% can be prepared.

为了有效回收炼铁渣中的铁，对炼铁渣进行三级细磨、二级重选以及一段筛分处理，制得了MFe含量90%以上的还原铁粉，实验表明2 t粉铁可制取出1 t还原铁粉，残渣则可用于制作陶瓷、免烧砖等，实现了资源综合利用。

The author believes that these stone artifacts show the essential characteristics of mid-Pleistocene pebble tool tradition and the presence of intermediate-sized and small-sized scrapers suggests an industrial movement from the early stages to the late stages of Paleolithic periods.

古交地区位于山西省太原市西部，境内旧石器时代遗存十分丰富。50年来，通过对这一地区旧石器时代遗存的研究，已经基本建立起本地区较为完整的文化发展谱系，为研究本地区旧石器时代人类的活动提供了可能。

The evolution of the stripping and gliding nappes can be divided into the following stages: regional differential elevation and subsidence, unstable gravity and gravitational sliding, the frist wholly stripping faults and sliding stage, and the following second and third stripping faults and sliding stages.

其演化过程概括为区域差异隆升、重力不稳定、重力滑覆、大规模第一序次的拆离断层和滑覆体、依次形成第二、第三序次拆离断层和滑覆体。

For example, roller-skating, it is necessary to learn in stages, first learn to stand, walk, taxiways, rapid glide seriously at all stages of treatment, in this over into foster children do integrity, and continuous.

比如滑旱冰，要分阶段学，先学站立，走动，滑行，快速滑行，各个阶段都认真处理，在这个过成中培养宝宝做事完整，连续。

Those who loved reading were obliged to send for their books from England; the members of the junto had each a few

那些喜欢看书的人就得从英国购书，讲读俱乐部的的成员每人都有几本。

Three fourths of the earth's surface is covered with water.

地球表面的四分之三被水覆盖着。