/'kəʊstə(r); `kostɚ/
n
1 (a) small mat put under a drinking-glass to protect a polished table, etc from drips 杯垫.
(b) small tray for holding a decanter, wine bottle, etc （放饮料瓶、酒瓶等的）小托盘.
2 ship that sails from port to port along a coast （沿海岸各港口航行的）轮船.

n[C]
a small thin object on which you put a glass, or cup, to protect a table from heat or liquids
a ship that sails from port to port along a coast, but does not go further out to sea
→roller coaster