They only have one room left: you'll have to double up with Peter.

他们只剩下一个房间，你只好与彼得合住了。

We'll have to double up on books; there aren't enough to go around.

因为书不够人手一册，我们只好合用了。

The lids of the casserole dishes are designed to double up as baking dishes.

这些砂锅盖子的设计使它们可以兼作烤盘。

The carpet is too thick to double up.

地毯太厚，折不起来。

The carpet is too thick to double up.

这地毯太厚没法折叠。