The boy's jaw went slack.

男孩张大了嘴巴。

The workload can be evened out, instead of the shop having busy times and slack periods.

商其工作量可以平均开来，不像商店那样有时很忙，有时很闲。

Many publishers have simply become far too slack.

许多出版商就是变得过于懈怠了。

He had never let a foreman see him slacking. [VERB]

他从未在哪个工头面前表现出丝毫懈怠。

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。