這座城堡的防衛非常森嚴，很難被攻破。
The defense of this castle is very strict; it is difficult to break through.
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Example sentences
敵人的防線終於被我們攻破了。
敌人的防线终于被我们攻破了。
The enemy's defense line was finally breached by us.
Usage Notes
Mainly used in military contexts to describe breaking through defenses, but can also be used figuratively for overcoming difficulties.
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