1.速度滑雪世界上最危险的运动之一。Speed skiing is one of the world's most dangerous sports.2.他成为第一个乘坐热气球穿越大西洋的人。He was the first person to fly over the Atlantic in a hot air balloon. 3.就我们所知，地球是唯一的有生命的行程。As far as we know, the earth is the only planet with life on it.4.他在危险面前总是镇定自若。He was always clam in the face of danger.5.虽然这次失败了，但你不应该放弃再次尝试。Though you failed this time, you shouldn't give up trying again.6.张开嘴巴吸进一些空气。Open your mouth and suck in some air. 很用心地回答，望采纳。
