lag

v.落后；减退；缓慢进行

n.落后；时间间隔

Some of the runners in the race began to lag. 参加比赛的运动员中有一些开始落後了。

Interest lags in such matters. 对这类事情的兴趣慢慢减少了。

It takes a lot of time to catch up with a cultural lag. 文化的落后需要长时间才能赶上。

There was a long lag in forwarding mail to us. 转寄给我们的邮件晚了很久才拿到。