1. Specifically, some experts are concerned about the creation of a new (and disrespected) social class: "the clones".
    具体说来，有些专家担心会出现一个新的（和不被尊重的）社会阶层，即"克隆阶层"。

2. Studies of Olympic athletes, world-class musicians and chess masters show that their common trait is the ability to motivate themselves to pursue harsh training routines.
    对奥运选手、世界级的音乐家和国际象棋大师的研究表明，他们的共同特点就是具有促使自己坚持艰苦的日常训练的能力。

3. Powerfrugal systems would keep electricity usage low so that the demand on outside sources is low.
    节能系统能使用电量降低，因此对外来电力的要求比较少。

4. Manya recited the prayer in a low voice, careful not to show her feelings.
     玛妮雅低声背诵了主祷文，谨慎地不流露自己的感情。

5. My father died from "the poor man's friend", pneumonia, one hard winter when his lung illnesses had left him low.
    肺病把我父亲折磨得虚弱不堪, 一个严冬，他死于被叫做"穷人的朋友"的疾病——肺炎。

6. My experience with a foreign language began in junior middle school, when I took my first English class.
    我学外语的经历始于初中的第一堂英语课。

7. Class is over,we play volleyball.
    下课了,我们打排球.

8. (An estimated 15 percent of male long distance runners have low iron stores.)
    （估计有15%的男性长跑运动员铁离子储量低。）

9. Certainly middle-class audiences did; the working-class audiences were more likely to clap for a character who revolted against authority,
    中产阶级当然这样认为；劳动阶级倒更有可能为这样一个反抗权势的角色拍手喝彩：

10. Unfortunately, the professor appeared and the class began.
    令人遗憾的是这时教授进来了，开始上课了。