The early climbers were looking for the easiest way to the top, because the summit was the prize they sought, especially if it and never been attained before.

早期登山者所寻找的是通往山顶的最方便的途径，因为顶峰特别是前人未曾到过的顶峰 -- 才是他们寻求的目标。

for fear the agents of other firms should be able to trace the kind of research they are likely to be undertaking.

他们生怕别的公司的情报人员据此摸到他们可能要从事的某项科研项目。

Knowledge began to increase as soon as the thoughts of one individual could be communicated to another by means of speech.

人一旦能用语言同别人交流思想，知识的积累便开始了。

our confidence in the curative properties of the bottle of medicine remains the same as theirs.

我们对瓶装药品疗效的信心仍与祖辈一样坚定。

easily obtainable from the lunar rocks in the form of liquid oxygen.

从月球上的岩石中很容易提炼出液态氧，

When it is eating normally, its own training begins.

当它进食正常了，训练就开始。