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If the progress of the solvent front is monitored closely, itis also acceptable to draw start and stop lines on the plate before the chromatogram is run (A pencil should be used because ink is soluble). This prevents inaccuracies that occur when the solvent evaporates before the final solvent front can be marked. Sketch the chromatograms in your lab notebook.

如果要密切监测溶剂前沿前进过程，可在进行层析前可以先把起始线和终止线先标上，这方法是可以接受的(应该用铅笔，因为墨水是可溶解的)这样的话可以避免由於溶剂前沿在被作标记前已挥发掉所引起的不准确度。

The unit is fitted with a plastic star wheel which prevents damage to labels or containers.

该单位装有塑料星轮可防止损坏标签或容器。

The centrifugal force from that prevents some of the gas from reaching the forming star. Instead, it forms an "accretion disk" around the star. The disk radiates away its energy and cools off.

而离心力阻止一些气体到达正在形成的恒星，相反，他们在恒星周围形成一个&吸积盘&，它向外辐射能量并冷却。

The dark green vegetable spinach contains folic acid that prevents problems in developing fetuses.

深绿色蔬菜-菠菜里的叶酸能保护胎儿的正常发育。

DCMU clearly prevents the stimulating effect of light,but sodium benzoate,a free radical scarvenger,has no effect.

光明显抑制乙烯形成，敌草隆对光促进乙烯形成有明显抑制效应，而自由基清除剂苯甲酸钠作用不明显。

This prevents adolescents from dropping off until around 11 p.m., when they produce the sleep-inducing hormone melatonin, and waking up much before 8 a.m. when their bodies stop producing melatonin.

这使得青少年直到晚上11点左右都不困，这是他们产生诱导睡眠的激素褪黑素的时间，而远早于早上8点他们就醒了，这是他们身体停止产生褪黑素的时间。

Printing cylinder that driven by pneumatic make the skid platform back off when there is no cup and double cups, so it prevents printing ink from contaminating cup die, avoiding polluting the inside of cup and damage rollers.

正常工作时出现空杯和双杯时，印刷滚筒由气动装置使滑台后退，防止油墨沾染印刷杯模而污染杯子内部和损坏胶皮。

The design of roller availably prevents to block up the sieve pore.

滚筒采用防止堵塞设计，有效防止筛网孔眼的堵塞。

More specifically the shunt structure prevents magnetic field from the portion of the write coil beyond the back gap from magnetizing a magnetic shield of the read head.

更具体而言，分路结构防止来自超过后间隙的部分写线圈的磁场磁化读头的磁屏蔽件。

The drawback of the short-time working scheme is that it prevents a broader economic restructuring.

缩短工时计划的弊端在于阻碍了更广范围内的经济结构调整。

The work of this paper is as follows: 1. Looking back the progressing history of the linear motor, introducing the features of the elevator driven by linear induction motor, radicating the topic of this paper "the digital frequency variable control of the elevator bi-side direct driven by linear induction motor". The research of this paper covers the conventional VVVF control, space vector based VVVF control, vector control and DTC.

本文主要开展了以下几个方面的工作： 1 回顾了直线电机发展历史，电机的驱动技术演变，特别是针对直线电机的驱动，简要介绍了直线感应电机驱动电梯的优点和不同结构类型，对传统的v／f控制，基于空间矢量法的v／f控制，矢量控制，和基于电压空间矢量的直接转矩控制进行了比较，确立了本课题的研究主题：直线感应电机双边直推式驱动电梯的全数字变频控制。

The article combines with the treatment of a superficial civil air defense work to introduce how the grouting method to improve the performance of the backfill soil.

文章从治理漂浮人防工事的角度提出了注浆技术在改善回填土性质方面的应用，并详细阐述了注浆技术的施工流程。