新兵们随着教官喊的“一二一”节奏整齐地前进。

The new recruits marched in unison following the sergeant's '___left-right-left' chant.

她在两个工作机会之间来回犹豫，无法做出最终决定。

She went ___back and forth between the two job offers, unable to make a final decision.