教练决定让汤姆在比赛中担任跑卫。

The coach decided to put Tom as the ___RB in the game.

球队正在寻找一名新的跑卫来增强进攻。

The team is looking for a new ___RB to strengthen their offense.

这项新药的有效性是通过RB验证的。

The effectiveness of the new drug was verified by an ___RB.