1.Abortion is defined as termination of pregnancy resulting in expulsion of an immature, nonviable fetus.

1.妊娠终止导致未成熟的、无法成活的胎儿被排出体外称为流产。

2.It's advisable that they go with a clearly defined goal in mind.

2.他们去时最好思想上有一个确的目标。

3.Howard Pattee, an early cybernetician, defined hierarchical structure as a spectrum of connectance.

3.早期的控制论专家霍华德·派蒂将层次结构定义为一个连接性频谱。

4.Leisure is usually defined in opposition to work.

4.休闲常被定义为工作的面。

5.The mountain was clearly defined against the light of the eastern sky.

5.东方天空的光芒使那座山清晰地显露出来。

6.The mountain was clearly defined against the eastern sky.

6.山巅被东方的天际衬托得轮廓格外分。

7.Please listen while I define your duties.

7.规定你的职责时, 请仔细听好。

8.The powers of a judge are defined by law.

8.法官的权限是由法律规定的。

9.Application of the cis-trans test defines the genetic unit of function, the cistron.

9.顺?可以用来确定遗传的功能单位―顺子。

10.Kinematics is defined as the study of motion without reference to massor force.

10.运动性是对不涉及重力和其他外力时汽车运动的研究。

11.The listener sidetone rating defines the effect of interference sound on the voice quality.

11.背景侧音当量是仿真量当电话使用吵杂环境畤由送话端回授到受话端的量。

12.The hardpoint's diameter is defined by the inner diameter, as seen in the image.

12.挂载点的直径就是指它的内径，如上图。

13.They defined him as a rogue.

13.他们确定他为骗子。

14.Based on the literature review, the design requirements of Zhang Heng's seismoscope are defined and concluded.

14.本研究针对具绳索与滑轮之失传张衡地动仪进行机构的拓朴构造合成。

15.Could you define the two terms-public relations and lobbyist respectively to our large number of readers?

15.您可以为刊广大读者分别定义一下公共关系和说客这两个词吗?。

16.It is ill to be defined.

16.很难下定义。

17.The following part defines and classifies denominal verbs.Related aspects are touched, including cognitive basis and conversion process.

17.第二部分对名动转用的定义、分类、认知基础及转换过程等方面进行了详细的叙述和分析。

18.I think probably the defining moment is when the Titanis feels like its life is in danger.

18.认为决定性的一刻可能是恐鸟感觉自己的生命处于危险中时。

19.Language, tool-making, and the regulation of sex are the chief defining features of man in contradistinction to other primates.

19.语言、工具的制作以及性的节制乃是人区别于其他灵长动物的主要的界限确的特点。

20.Please define the words.

20.请准确地解释这些字的意义。