一个英语句子Onebyone,thekidsstarttopitchin,siftingtheirwaythroughthewreckage.(孩子一个接着一个,开始协力在灾难中寻找生路)怎么理解pitchin和sifting的意思,请结合句子回答.

Question

一个英语句子
One by one,the kids start to pitch in,sifting their way through the wreckage.(孩子一个接着一个,开始协力在灾难中寻找生路)
怎么理解pitch in 和sifting的意思,请结合句子回答.

Answer 1

pitch in
口语,动手干,使劲干：pitch in on housework忙着做起家务；
协力,作出贡献：Everywhere people pitched in to help.到处都有人协力相帮.
开始大干特干,拼命干起来：If everyone pitches in,we'll soon get the job done.如果大家拼命干,我们很快就会把这个工作干完.
sift
筛选
sifting their way through the wreckage就是如通过筛具般在残骸中走出一条路