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Based on experiments, the movement of the wetting front was studied in clayloam, loam, and in sandy soil under point drip irrigation, and the effects of soil types, soil density, soil initial moisture, dripper discharge, and drop water to the movement of wetted front were analyzed.

以试验为基础，针对重壤土、中壤土、砂壤土研究滴灌点源入渗的湿润锋运移规律，分析土壤种类、土壤容重、土壤初始含水率、滴头流量、灌水量等主要因子对湿润锋运动的影响。

By mono-factor analysis of the point drip infiltration,the horizontal and vertical movement distance of soil wetting front were not only in close relation with dripper discharge and drop water,but also had good power functional relation which exists with the soil characteristic ( soil density, soil initial moisture).

以室内试验为基础，测定了重壤土、中壤土、砂壤土在不同滴头流量、不同灌水量下的点源入渗运动过程，通过对点源入渗特性的单因子分析表明，湿润锋水平、垂直扩散距离不仅与滴头流量、灌水量关系密切，与土壤特性(土壤容重、初始含水率)也存在良好的幂函数关系，得出了以土壤物理参数和湿润比及湿润深度为基础的点源滴灌滴头流量的设计模式

Based on the analysis of operation mechanism and development of the charge pump,as well as the factors limiting its efficiency and speed,a new method using triple-well structure and charge transfer switches is suggested to eliminate threshold voltage drop and body effect.The clock driving circuit is specially optimized to lower output resistance,and speed up the response.

在分析电压泵工作原理和结构演变并指出当前实现方法在驱动和响应上的制约因素的基础上，结合目前先进Flash Memory工作电压和工作要求，提出了结合三阱工艺和CTS方法以消除体效应和阈值电压降从而提高性能的四相位电荷泵设计方法，专门对时钟驱动进行的优化，提高了响应速度。

I fear lest it droop and drop into the dust.

我怕它凋谢了，落入尘埃中。

Personal problems led -Wil-liams to drop out of Washington University and enroll in the University of Iowa.

个人问题的LED威廉姆斯辍学华盛顿大学和加入艾奥瓦大学。

Others find no stimulation in their studies, and drop out ------often at the encouragement of college administrators.

其他人发现学习中没有动力，辍学------大学管理人员常常鼓励他们这样做。

Nearly 100 per cent enrolment in primary education (aged 6– 14) is within sight, but literacy is still less than 70 per cent and drop- out rates average 31 per cent.

尽管小学教育（6岁至14岁）的入学率接近 100%，但识字率仍低于70%，辍学率则平均高达31%。

At any time, roomless students have an incentive to bid on whichever room offers the best combination of price and quality - or to drop out if they think the smallest room looks cheap.

在任何时候，未得标的人都有动力去投标性价比最高的房间——或在他们认为最小的房间看上去很便宜时选择退出。

By the time you figure out the game, its cost may equal that of a college education, only most students never graduate - they drop out and get nothing for their money except for memories of a few wild rides.

当你搞清楚这个游戏的时候，花费差不多可以读个大学了，而且大部分学生无法毕业——他们退学了，交了不少学费，除了一点狂野的记忆，什么都没得到。

Darrell was a high school drop- out.

达里尔从中学退学了。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。