humming
['hʌmɪŋ]
v.
发出嗡嗡声，哼唱( hum的现在分词 );
忙碌，活跃;
例句:
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He puckered his eyes, made a humming noise.
来自NEWYORKER
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The guard stopped his humming and turned his head sharply.
守卫停止了哼唱，猛地转过头。
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There was a low humming sound in the sky.
空中传来一阵低沉的嗡嗡声。
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Within five hours, the equipment will be humming away again.
用不了5小时，设备就又能嗡嗡地运转了。
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I could actually feel the virus humming happily through me.
来自NEWYORKER
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For a little while a humming sound could be heard.
来自NEWYORKER