When not in use, the fins are tucked into special grooves or depressions so that they lie flush with the body and do not break up its smooth contours.

当鱼不使用鱼鳍时，会将它们折叠起来，收回到特殊的沟槽或者凹陷部位；这样鱼鳍就可以与身体保持齐平，以维持它们平滑的外形。

youdao

The headmaster warns us not to break the school rules, or we'll be punished.

校长警告我们不要违反校规，否则我们将受到惩罚。

youdao

And if you keep your curtains closed, burglars are less likely to try and break in because they can't be sure whether someone's home or not.

如果你把窗帘拉上，窃贼就不太可能试图破门而入，因为他们无法确定是否有人在家。

youdao

This is necessary so that the walls of a building will not shrink or break.

VOA: special.2009.01.12

No one wants to hire workers unnecessarily, tax break or not.

FORBES: Connect

I've worked in the private sector and in every company I've worked, you couldn't take a smoke break paid or not paid.

BBC: Clocking cigarette breaks: Your comments

Mr. Ivanov says his group plans to break ground whether or not there is any preleasing.

WSJ: Trump-Branded Rio Project Faces Test