如遇危险，乌龟会把头和四肢缩进去。

Tortoises are able to withdraw their heads and limbs should danger threaten.

youdao

现在襟翼全部收缩进去了。

Now the flaps were fully retracted.

youdao

信的主文接在问候语之后，里面是给读信者的讯息与问题，每一个新的段落或想法的开始要缩进去几个空格。

The main body of the letter follows the greeting. It contains the information and questions for the reader. Indent each new paragraph or thought.

youdao