Intrasonic
超低频
🗣️ 情景例句
These are polite questions.
这些问题都是礼貌的。
We no longer manufacture pure cotton shirts as their retail prices tend only to attract that upper end of the market.
我方已不再生产纯棉衬衫因为其零售价格只能吸引高档消费者。
It was rather like an exhibition of prehistoric electronic equipment.
这儿倒像是在展览古老的电子设备。