1-run low 几乎用完，快用完了

There are two main reasons supermarkets are running out on toilet paper.

2-just in time inventory 适时存货制

Supermarkets tend to operate what's called " just in time inventory ".

3-stockpile 储备物，囤积物

In other words, they don't like to have big stockpiles of goods like toilet paper hanging around.

4-packet 小盒，小包，小袋

If just half a dozen or a dozen people buy extra packets, suddenly the demand lifts quickly and it's hard to keep that stock on the shelf.

5-in the pipeline 在筹备中，在进行中

We have enough supply in the pipeline to satisfy the Australian market, but they are clearly struggling with the issue of replacement.

6-go through 大量使用

If you normally go through four toilet rolls a week, maybe buy eight, because that covers two weeks.