arsis

例句：

1. 1.The athlete's arm was injured during the race.
   这位运动员在比赛中手臂受伤了。
2. 2. He lifted the heavy box with his strong arm.
   他用强壮的手臂提起了这个沉重的箱子。
3. 3. She used her arm to steady herself as she walked.
   她用手臂稳住自己，一边走一边。