trail ·verb (FOLLOW)
Definition: to follow or come behind Level: C2
一列警车为总统的豪华轿车开道，其他车辆则尾随其后。
A string of police cars led the president’s limousine, and others ___trailed behind.
那艘小帆船跟随着大帆船穿过了广阔的海湾。
The small sailboat ___trailed the larger one across the vast bay.
我们的科技飞速进步，但有时我们的道德框架似乎远远落后。
Our technology advances rapidly, but sometimes our ethical frameworks seem to ___trail far behind.