上升气流

例句：

1. 1. The mountain ascent is treacherous and requires careful planning.
   攀登这座山是危险的，需要仔细规划。
2. 2.The ascent of the mountain was arduous but rewarding.
   攀登这座山是艰难的，但也是值得的。
3. 3. The ascent of the mountain was arduous but rewarding.
   攀登这座山是艰难的，但也是值得的。