1. Two main techniques have been used for training elephants, which we may call respectively the tough and the gentle.
    驯象有两种主要的方法，我们分别称之为强硬法和温柔法。

2. The third, or main wave, is the slowest and has travelled round the earth through the surface rocks.
    第三种波，即主波，是最慢的，是围绕地球通过表面岩石传来的。

3. Turning back down the main street, we quickened our pace and made our way rapidly towards the stream where we hoped the boatman was waiting.
    便掉转身子，沿着那条主要街道加快步伐，快速地朝深溪边走去，希望船夫还在那儿等着我们。

4. The pictures it sent us were very disappointing because its main mirror was faulty!
    它传送给我们的图像很令人失望，因为它的主要镜子有误差。

5. The main problem facing Christiaan Barnard was how to prevent the body´s rejection of the new heart.
    现在，克里斯蒂安·巴纳德所面临的主要问题是，如何防止人体对新心脏的排斥。

6. There were two main reasons which prevented John Hunter from being able to do many operations which he could otherwise have done.
    有两个主要原因使得约翰·亨特不能做许多本来完全可以做的手术。

7. The main predictors of destructive levels of stress are the FUD factors —
    他说, 压力达到毁灭性程度的主要预测指标是FUD因素

8. This position gives off "stay away" signs and prevents your main "sign sender" (your mouth) from being seen by others looking for inviting conversational signs.
    这个姿势发出的信号是“离远点”，使得别人看不见你的主要“信号发送器(嘴)”，而他们正在寻找吸引其交谈的信号。

9. The main causes of recent delays have been linking two very different railroad systems.
    近来工期拖延的主要原因，是要将两条不同的铁路系统连接起来。

10. Then the medical worker alerted the main welfare office at the state capital.
    接着医务人员就通知州府的福利总部，