Such sudden alternations from mental vacuity do sometimes occur thus quietly.

空虚的心灵有时就是这样不知不觉地发生这样的变化。

Man, woman, man, in a ring of endless alternation round the table.

一男，一女，一男，一女… … 围着桌子形成了圆圈，无穷地交替着。

Two days passed in cruel alternations.

两天在残酷的交替中过去了。

The orderly alternation of day and night made the weather warm and mild.

白天和黑夜的有序交替使天气温暖而温和。

Furthermore, a thousand or more inheritable birth defects result from alternations in gene patterns.

由于小小的基因负责编码大量身体所需的化学物质，基因丢失或者工作异常都会严重损害健康。

They are composed of heavy, compacted snow, which has been subjected to frequent alternations of freezing and thawing.

它们由厚重、压实的雪组成， 经过频繁的冻融交替。

In such alternations the evening winged away; till at last came the gloomy words, " Margery, our time is up" .

黄昏飞走了； 直到最后传来阴沉的话语， “玛格丽，我们的时间到了” 。

After that, for a while, everything was merged in her brain in swimming circles of heat and blinding alternations of light and darkness.

在那之后的一段时间里，一切都在她的大脑中融合成游动的热圈和令人眼花缭乱的光明与黑暗的交替。

This cycling between sexual and asexual phases is called the alternation of generations, and it helps keep plants flourishing, from Granddaddy Succulent to Great-grandbaby Succulent — and even beyond that.

这种有性和无性之间的循环被称为世代交替，它有助于保持植物的繁盛，从祖孙多肉植物到曾孙多肉植物，甚至更远。

Dark as it was getting, I could still see these changes, though but as mere alternations of light and shade; for colour had faded with the daylight.

天色越来越暗，我仍然可以看到这些变化，尽管只是光影的交替；因为颜色随着日光而褪色。