士兵们将敌人阻挡住，直到援军到达。

The soldiers ___held ___at ___bay the enemy until reinforcements arrived.

她用幽默来抑制自己的焦虑。

She uses humor to ___keep ___at ___bay her anxiety.

定期锻炼有助于预防疾病。

Regular exercise can help ___keep ___at ___bay illnesses.