So basically, if we were to place a baby on the mother's abdomen, the baby would actually crawl up the mother's chest and choose which breast it would like to latch on to.

VOA: special.2010.08.04

You've got to learn to crawl before you learn to run.

在你学会跑之前你得学会爬。

麻省理工公开课 - 固态化学导论课程节选

It could be the response is 'there's something dangerous in the environment, we got to move away', and so the response is for the cell to crawl in the opposite direction.

这个信号还有可能是,"外面很危险,我们得赶紧跑",于是细胞就向相反方向游走了

耶鲁公开课 - 生物医学工程探索课程节选

"You cannot build a foolproof system for air security unless you are willing to slow the whole air system down to a crawl and institute very, very invasive procedures before Americans get on airplanes,".

VOA: standard.2009.12.30