1864, originally in rugby, where the ball is literally touched down on the other side of the goal, from verbal phrase (by 1859 in sports), from touch (v.) + down (adv.). As "landing of an aircraft" from 1935.
权威例句
1. The crowd yelled when the hometown team scored a touchdown.
当他们自己的队得了底线分时,人群高声呼喊起来.
2. The Tigers broke the ice with a touchdown.
虎队首先底线得分,打破僵局.
3. He caught a punt and scored the winning touchdown, with a minute left to play.
他接住对方的弃踢球,成功达阵,取得了制胜得分,此时比赛只剩最后一分钟。
4. Controlled land landing also demanded some way to cushion touchdown impact.
定点控制着陆还要求解决着陆时所产生的强大冲力问题.
5. The touchdown happened a little late because of cloudy and windy weather.