形容词
中文翻译：未受保护的
同义词：
['unguarded', 'unprotected', 'unprotected例句：1. The prisoner was undefended when the guards left him alone.（当警卫离开时，囚犯是未受保护的。）']
例句：
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1. The prisoner was undefended when the guards left him alone.
当警卫离开时，囚犯是未受保护的。
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2.The treasure was undefended, and it could be easily stolen.
宝藏未受保护，很容易被偷走。
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3.The forest was undefended, and it was easy for predators to enter.
森林未受保护，很容易让掠食者进入。