ascents

例句:

• The cart was very heavy , and in addition , there were many ascents.
  这辆车实在难拉,而且又很重, 还得上许多坡.
  
• Balloon ascents overcome this hazard with ease.
  升空的气球能轻而易举地克服这一困难.
  
• A song of ascents. Of David.
  大卫上行之诗.
  
• Many manned ascents were made with both hot-air and hydrogen balloons.
  来自Encyclopedia Britannica
• So the team trained intensively at altitude, in the heat, and on mountain ascents.
  来自BBC
• By high school, he'd discovered rock climbing, becoming a self-described "dirtbag" who loved to tackle risky ascents.
  来自WSJ