军士长负责训练新兵并确保他们遵守纪律。

The ___sergeant-major is responsible for training recruits and ensuring they follow discipline.

潜水时，我看到一条色彩斑斓的军曹鱼在珊瑚丛中游动。

While diving, I saw a brightly colored ___sergeant-major swimming among the corals.