Replace what you've used. For example, fill up the copier or printer with paper after you're done using it.

把自己用完的东西补上。不如说在使用完复印机或者钉书机后装满纸盒钉。

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They are also treating recently retired staff as a just-in-time workforce that can be used to cope with surges in demand or to fill in for absent colleagues.

他们还把最近退休的员工当做及时劳动力，用来填补需求增大或有旷工时的缺口。

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For residents, the system works like this: first, they peel off the labels from the empty clear plastic cooking oil bottle and rinse it; next, they fill it with their used cooking oil.

市民首先要做的就是撕掉空塑料油瓶的标签并将它清洗干净；接着将废弃食用油倒入瓶中。

youdao

This observation explains the huge amounts of corporate cash reserves we now have that could be used for new products, but are stalled while electronic storerooms fill up with great ideas.

FORBES: Why Did Big Ideas Die?

But that needs skilled staff of the type that used to fill even the lowest ranks of the Bank of England, famed for supervising with a nod and a wink.

ECONOMIST: The Financial Services Authority

For years, American cosmetic surgeons and dermatologists have used bovine collagen to puff up lips and fill in facial folds.

ECONOMIST: The cosmetic-enhancement business