a type of aircraft without wings , that has one or two sets of large blades which go round very fast on top . It can land and take off vertically and can stay in one place in the air
发音
例句
1. The helicopter is flying at a height of 5,000 meters. 这架直升机正在五千米的高空飞行。 2. The pilot landed the helicopter in a rice field. 飞行员将直升飞机降落在一片稻田里。