后备队；预备队

резерв; второй эшелон; запас; ядро [авангарда]

把后备队调到战场上

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战争期间后备队很快动员起来。

The reserves were quickly mobilized during the war.

教练正在帮助后备队中有前途的年轻人提高技术。

The coach is bringing on some promising youngsters in the reserve team.