Be sure to work in a ventilated area.

工作一定要在通风良好的地方。

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Use in a well ventilated area during and after use!

在一个好通气的区域在期间并且在使用以后的使用！

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Then just make sure to hang the sweater to dry in a well-ventilated area.

接下来确保将毛衣挂在通风良好的区域晾干。

youdao

And if you put this in the well-ventilated area, if you prepare this outside, the h c n gas will actually be released into the air, so you're safe, you can eat it later.

而如果你把它们放在通风良好的地方，在室外处理，那么氰化氢气体,将会被释放到空气中，这样你就安全了，过后就可以吃了。

麻省理工公开课 - 化学原理课程节选