touch down
phrasal verbtouch down 
- (of a plane, spacecraft, etc.飞机、航天器等 着陆;降落 - The helicopter touched down on the helipad.直升机降落在直升机停机坪上。 
 
- The helicopter touched down on the helipad.
- (of a tornado) to make contact with the ground着陆;降落 - Tornadoes touched down in Alabama and Louisiana.龙卷风在亚拉巴马州和路易斯安那州登陆了。 
 
- Tornadoes touched down in Alabama and Louisiana.
- (in rugby橄榄球 (在对方球门线后)持球触地得分;达阵