请把杯垫放在杯子下面，以免弄湿桌子。

Please put ___coasters under your cups to keep the table dry.

我最喜欢游乐园里那些高速下落的过山车。

I love the fast-dropping ___coasters most at the amusement park.

这些沿海货船主要在近海运输建筑材料。

These ___coasters mainly transport construction materials along the coast.