They seem to have sometimes whole body convulsions.

它们有时似乎全身抽搐。

Then he seemed to look for somebody and, catching sight of Sernine, had a convulsion of anger.

然后他似乎在寻找什么人， 一看到瑟宁， 就怒火中烧。

You'll have to call upon all of your willpower to ignore this instinct to breath, which will then lead to your diaphragm having convulsions.

你将不得不调动你所有的意志力来忽略这种呼吸的本能，这将导致你的隔膜抽搐。

It delights me to see you in spirits: Besides you seem tranquil and easy, and I hope that you will have no more convulsions.

看到你兴致勃勃， 我很高兴：此外， 你看起来平静而从容， 我希望你不会再抽搐了。