and that their commissariat had no organization, but depended on irregular raids.

他们的军需供应处于无组织状态，只是靠临时抢夺来维持。

with their fellow scientists either in other countries or in universities,

和其他国家、其他大学同行们

If it is not a question of resting the body, then perhaps it is the brain that needs resting? This might be a plausible hypothesis were it not for two factors.

如果睡眠的功能不是在于使身体得到休息，那么也许是让大脑得以休息？若不是下面两点，这种假使似乎是有道理的。

The remains of plants and animals that lived on land are much more rarely preserved, for there is seldom anything to cover them over.

曾在陆地上生活过的动植物的遗体被保存下来的更为罕见，因为陆地上几乎没有什么东西覆盖它们。

At the age of twelve years, the human body is at its most vigorous.

人体在12岁时是生命力最旺盛的时期。

it is not always safe by the time it reaches the tap.

等水到达龙头时就不一定总是安全的了。