line crawl

• 爬行,行蠕动,线滑降

line crawl的用法和样例：

例句

1. Babies may not try to crawl or roll over.
   婴儿可能不会尝试着去爬行或者翻身。
2. I began to crawl, keeping as low as possible.
   我开始爬行，尽我可能的降低重心。