Rattlesnakes sense prey by the heat they give off and the squirrel is able to take advantage of this.响尾蛇透过体温感应猎物，地松鼠可以利用这点。

give off散发(光、气味等)

The sun gives off heat and light.

太阳散发光和热。

Rotten eggs give off a bad smell.

臭蛋散发出难闻的气味。

be able to会； 能

He was able to cast off such an uninteresting task.

他终于摆脱了这么一项乏味的工作。

You are better able to do it than I (am).

你比我更有能力做这件事。

take advantage of利用；占…的便宜

It never occurred to me to take advantage of him.

我决没有想到过要占他的便宜。

Don't take advantage of the greenhorn.

不要占那新手的便宜吧。

She heats up her tail with warm blood.它以温暖血液加热尾巴

heat up加热； 加剧

The game didn't heat up until the second half.

游戏玩到后半场才热闹起来。

You would better heat up the tomato soup .

你最好把蕃茄汤热一下。