Ultraphonics
超声学
🗣️ 情景例句
We were all sorry when we heard that your brother had had an accident.
我对你弟弟的意外感到遗憾。
He informed them that his mother had died.
他通知他们的母亲死了。
In order to tell the bees apart, he painted some bees with little spots of colour.
为了区别这些蜜蜂，他在一些蜜蜂身上涂上小色点。