support arm shaft

例句：

1. 1. The engineer carefully supportedthe heavy machine with his arm shaft.
   工程师小心翼翼地用他的手臂支撑着这台重型机器。
2. 2. The car was so old that itneeded a new arm shaft to be repaired.
   这辆车太旧了，需要更换新的支臂轴才能修理。
3. 3. The constructionworker used his arm shaft to lift theheavy load.
   建筑工人用他的手臂支臂来举起沉重的货物。