We must be on guard against hidden enemies.
我们必须警惕暗藏的敌人。
There seemed no end to the hidden enemies at whom he raved .
他极力反对的隐蔽的敌人似乎还没有停止活动。
The hidden enemies are more deceiving than the overt ones, so they are more dangerous.
隐蔽的敌人比公开的敌人具有更大的欺骗性，因而具有更大的危险性。
The hidden enemies are more deceiving than the overt ones, so they are more dangerous.
隐蔽的敌人比公开的敌人具有更大的欺骗性，因而具有更大的危险性。
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