the landing of an aircraft or of some types of spacecraft

One of the plane's tyres burst on touchdown. 着陆时，飞机的一个轮子爆胎了。

(in American football) the act of scoring points by carrying the ball across the other team's goal line or throwing the ball so that it is caught by a member of your team who is across the other team's goal line

(in rugby) the act of scoring points by putting the ball down on the ground behind the other team's goal