Definition: a very slow speed Level: C1
施工使交通缓慢到爬行速度。
Construction work slowed traffic to a ___crawl.
高峰时段，高速公路减速到爬行状态。
During rush hour, the highway was reduced to a ___crawl.
顾客队伍缓慢移动。
The line of customers moved at a ___crawl.
