Turn on back wash drainage valve (V-4) and air scour valve (V-2). Air scour lasts for a moment.

将反洗排水阀(V - 4)，空气洗净阀(V - 2)置于[开]，进行空气清洗并持续一段时间。

youdao

Dear classes, in Unit1 we learnt some v. such as: cook, make, wash, dry, ect.

亲爱的同学们，我们在第一单元学了一些动词，比如：cook,make,wash,dry等。

youdao

Dear classes, in Unit1 we learnt some v. such as: cook, make, wash, dry, ect.

亲爱的同学们，我们在第一单元学了一些动词，比如：cook,make,wash,dry等。

youdao