Extra men are needed to secure the camp against attack.
需要增加兵力以保护兵营免受攻击。
You cannot secure yourself against all risks and dangers.
人有旦夕祸福,天有不测风云。
By strengthening the embankments they secured the village from floods.
他们加固河堤,目的是让村子免受洪水之灾。