indefensibility
检查站因为军事上无法防御而被舍弃。
The checkpoint was abandoned as militarily indefensible.
《柯林斯英汉双解大词典》
这个要塞无法防御来自空中的袭击。
The fort can't be defended against an air attack.
youdao
这座要塞遭到空袭时无法防御。
The fort can not be defended against an air attack.
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