一转

Sodium arsenite (NaAsO2), a potent human carcinogen, has not been clearly understood what its carcinogenesis is.

砷化钠(sodium arsenite； NaAsO2)是一种环境致癌毒物，目前对其致癌的机转仍不清楚。

At a General Dynamics plant in Michigan, the Duke wanted to show he was no softie on defense, so took a spin in a tank.

在密歇根州的一家通用动力工厂，Dukakis在坦克里转了一圈，向人们展示他在防御上并不是一个柔弱的人。

The identification and study of the control factors that regulate gene expression at different stages are of great value to elucidate the mechanism of spermatogenesis and spermiogenesis. Such study can also provide foundation and cues to investigating the mechanism of infertility and immunological contraception.

作为体内高度分化的雄性生殖细胞，精子发生过程中经历了从形态到生化的复杂变化，在这一过程中有一系列的特定基因按严格的时空顺序转录和翻译，因此寻找和研究不同发育阶段的差异表达的基因，将有助于最终阐明精子发生的机理，并为控制生育和不育机理的探索提供新的线索。

And it has also been demonstrated that acid sphingomyelinase, an enzyme responsible for hydrolyzing sphingomyelin to generate ceramide, could be activated at the same time.

同时，一种可以水解鞘脂类物质产生神经酰氨的酸性鞘磷脂酶往往在此过程被激活，这些过程对于胞内信号转导具有重要的作用。

The company was founded by Kiichiro Toyoda in 1937 as a spinoff from his father's company Toyota Industries to create automobiles.

该公司由丰田喜一郎於 1937年转投资从他父亲的公司丰田汽车制造工业。

A casting (38) secured in the casing mounts the further lock means (39, 40), provides part-bearings (38b; 138b) for pivot rods (41, 43) of the handle (36) and a bolt locking element (44), provides a guide slot (138d) for a spring-like connector (49) linking the handle to the bolt locking element, and provides a pair of arms (66) between which slides a bolt release member (69) and against which bears one end of a biasing spring around part of the bolt release member.

为该手把(36)和一栓件锁定件(44)的枢转杆(41、43)提供部分轴承(38b、138b)，为将该手把连接到该栓件锁定件上的一个弹簧状的连接件(49)提供一个导向槽(138d)，和提供一对臂(66)，一个栓件释放件(69)在其间滑动，且一个偏压弹簧的一端围绕该栓件释放件的一部分抵靠该臂。

Terrified, he spun around to see what he could see of himself.

他吓得不行了，他转了一圈看着自己。

Afterwards Squealer made a round of the farm and set the animals' minds at rest.

后来，斯奎拉在庄园里转了一圈才使动物们安心下来。

Since DTC is a newly developed method, recently it is an important and challenging area in the field of AC drives. In this thesis, attention is focused on DTC of squirrel cage motors and electric vehicles driven by AC motors.

DTC作为近年来发展的一种新型的控制技术，成为了交流电机控制领域的研究热点，本文的研究就是针对鼠笼电机转矩控制以及电动车驱动控制的技术而系统地展开的。

Aimed at the problem of choosing the initial value when the Newton method is used to compute the controlling unstable equilibrium point, a practical and rigorous solving scheme was presented: by identifying the controlling load bus of the given fault, and using the Thevenin equivalent circuit to represent the rest of the system at the state of the post disturbance stable equilibrium point, using the steady equivalent circuit to represent the induction motor in composite load, and then using the torque characteristics of induction motor, a point near the CUEP is gained to be the initial value. The second order normal forms was used to approximate the stable manifold of CUEP, and the local approximating boundary of the region of attraction of the post disturbance stable equilibrium point was gained. Then just by simulating the state of the system at the fault clearing time, the transient voltage stability of the system could be determined.

针对采用牛顿法求取故障后系统主导不稳定平衡点(controlling unstable equilibrium point，CUEP)存在的初值选取难题，提出一种实用但不失严谨的解决方案：通过识别给定故障的主导负荷母线，对主导负荷母线以外系统由故障后稳定平衡点处的状态进行戴维南等值，对负荷中感应电动机部分采用其稳态等值电路，再由感应电动机的转矩特性求得CUEP附近的一个点作为近似的CUEP，以此为迭代初值可靠求得CUEP；采用二阶正规型来近似CUEP的稳定流形的方法求得近似的局部吸引域边界；由仿真得到故障清除时刻系统的状态并根据该状态是否位于吸引域内判断系统的暂态电压稳定性。

But we don't care about Battlegrounds.

但我们并不在乎沙场中的显露。

Ah! don't mention it, the butcher's shop is a horror.

啊！不用提了。提到肉，真是糟透了。