1 a container for holding liquids or gas; the amount that a tank will hold 水箱；气罐；一箱或罐的量: a water/fuel/petrol/fish tank 水箱；燃料箱；油箱；鱼缸We drove there and back on one tank of petrol. 我们靠一箱汽油开车来回跑了一趟。 ☞pictures at dive and motorbike 见dive及motorbike插图

2 a large, heavy military vehicle covered with strong metal and armed with guns, that moves on special wheels 坦克