Spiders are busy for at least half the year in killing insects.

蜘蛛至少有半年在忙于吃昆虫。

where chance discoveries play a much larger part than they do in physical and mechancal industries.

同物理和机械工业相比，化学工业中偶然发现的机会要多得多。

He had lived in it as a child when it was already disappearing,

作为一个孩子他曾在西部生活过，当时西部拓荒生活正在消失。

The great advantage of taking medicine is that it makes no demands on the taker beyond that of putting up for a moment with a disgusting taste,

对服药人别无其他要求，除了暂时忍受一下令人作呕的味道外，

and realized that it was a sign that the child was growing up and developing valuable powers of observation and independent judgment,

并且意识到这象征着孩子们正在成熟和发展宝贵的观察力、独立判断力，

Normal people tend to forget this process unless and until they are reminded of it.

衰老的过程，不经提起，正常人容易忘记；一经提醒，才会记起。