Usage priority
Collins 词频等级为 1，建议结合例句记忆，而不是只背中文释义。
密不透风
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密不透风
not admitting of penetration or passage into or through
an impenetrable fortress
正在加载中文释义…
not admitting of penetration or passage into or through
正在加载中文释义…
permitting little if any light to pass through because of denseness of matter
正在加载中文释义…
impossible to understand
impenetrable rain forests
dense smoke
heavy fog
impenetrable gloom
impenetrable jargon
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Collins 词频等级为 1，建议结合例句记忆，而不是只背中文释义。
Dictionary facts from ECDICT.