Usage priority
Collins 词频等级为 2，建议结合例句记忆，而不是只背中文释义。
先理解核心含义，再看它在真实句子里的用法。
the state of being or appearing to be actively engaged in an activity
they manifested all the busyness of a pack of beavers
正在加载中文释义…
the state of being or appearing to be actively engaged in an activity
正在加载中文释义…
an Islamic fundamentalist group in Pakistan that fought the Soviet Union in Afghanistan in the 1980s; now operates as a terrorist organization primarily in Kashmir and seeks Kashmir's accession by Pakistan
正在加载中文释义…
a humming noise
there is a constant hum of military preparation
the hum of distant traffic
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Collins 词频等级为 2，建议结合例句记忆，而不是只背中文释义。
页面下方列出了常见词形变化。学习时注意它们在句子中的语法位置。
Dictionary facts from ECDICT.