... infrasonic c frequency 次声频 infrequent t 稀有的，不常见的 infusion n 输液，输注 ...
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... encounter r n.&v. 遭遇 infrequent t adj. 很少发生的 speculative adj. 猜测性的、投机性的 ...
infrequent t
罕见的t
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Infrequent use doesn't help either, since the mechanisms can dry out.
WSJ: It Takes Brass to Play the Wagner Tuba | By Barbara Jepson | The Ring of the Nibelung
It's not just infrequent travelers who get burned, but sometimes road warriors who happen to switch programs and don't pay attention to the old program.
WSJ: Saving Frequent-Flier Miles From the Ax
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