士兵们在夜间将敌人阻挡在远处。

The soldiers ___held the enemy ___at ___bay during the night.

她用幽默来抑制她的恐惧。

She uses humor to ___keep her fears ___at ___bay.

定期锻炼有助于预防疾病。

Regular exercise can help ___keep illnesses ___at ___bay.