Definition: to get on a horse or bicycle Level: C2
我帮助他上马。
I helped him ___mount the horse.
仅仅走了一小段路后，他就不得不帮助他们中的两个人上骡子。
After only a short walk, he had to help two of them to ___mount the mules.
骑师在比赛开始前迅速上马。
The jockey quickly ___mounts the horse before the race starts.
