The boy's jaw went slack.

那个男孩张大了嘴巴。

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

工作量可以均衡分配，商店就不会有旺季和淡季。

Many publishers have simply become far too slack.

许多出版商简直太过松懈。

If someone slacks off, Bill comes down hard.

如果有人偷懒，比尔就会严厉训斥。

He had never let a foreman see him slacking.

他从未在哪个工头面前表现出丝毫懈怠。