预热

shǒu xiān nǐ yào yù rè lú zi

首先，你要预热炉子。

First, you need to preheat the oven.

tā kāi shǐ yù rè fēi jī yǐn qíng

他开始预热飞机引擎。

He started to warm up the aircraft's engines.

wǒ men yǒu yī xiē yù rè huó dòng

我们有一些预热活动。

There are some activited to warm up.