slack up

As major airlines give up less-traveled routes, smaller planes are picking up the slack.

由于大型航空公司放弃了乘客较少的路线，一些较小的飞机正在加紧补位。

Trade has been slack for the past six months, but it is now picking up.

在过去六个月中贸易一直不景气, 但现在状况正在好转.

Slack up the tent ropes before it rains.

在下雨之前把帐篷的绳子放松.

The doctor advised Facer to slack up for few days, as his lifestyle was having a bad effect on his heart.

医生劝告费塞放松几天, 因为他的生活方式对他的心脏产生了不良影响.

Slack up before you reach the cross-roads.

到交叉路以前减速.

Don't slack up your effort , as we are getting to the end.

快到完成的时候了,别松劲啊.

It's time to slack up a bit.

该稍微休息一下了.

Slack up before you reach the crossroads.

驶近十字路口时要减低速度.

Please slack up your speed. I can't run as fast as you!

请你跑慢点! 我跑得没你快.

Don't slack up your effort, as we are getting to the end.

快到完成的时候了，别松劲啊。