not justifiable by argument
站不住脚的,无法辩解的
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the policy of apartheid was morally indefensible .种族隔离政策在道德上是站不住脚的。
not able to be protected against attack
无法防御的,无法守卫的
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the towns were tactically indefensible .这些城镇从战术上讲是无法防御的。
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