4周搞定2000+托福核心词
[经] 疲软的；虚弱的；无力的；不牢固的
weak
常考释义
Actually, there are some species of bats, the ones that don’t use echolocation that do rely on their vision for navigation, but it is true that for many bats, their vision is too weak to count on.
Actually, there are some species of bats, the ones that don’t use echolocation that do rely on their vision for navigation, but it is true that for many bats, their vision is too weak to count on.
来源于：听力OFFICIAL7 L2adj. 疲软的
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