As a result a reflected wave is sent back into the water, but this is a rare faction wave.

结果，向水中送回一个返射波，但这是一种稀疏波。

youdao

The rare earth permanent magnet brushless DC square wave motor is a new type of motor. With its high performance, the motor shows a broad prospect for further advances.

稀土永磁无刷直流方波电机是一种新型电动机，其性能优越，发展前景广阔。

youdao

At present, the law of the research on traveling wave effect for cable-stayed bridge with support system is rare in domestic.

目前，国内对于支承体系斜拉桥行波效应影响规律的研究成果并不多见。

youdao

Cars are so rare that children wave excitedly as you drive by, and chickens fearlessly block your path.

ECONOMIST: No title

Passenger traffic is rare on the CPR these days, so rare that farmers and even trackmaintenance workers wave and cheer like the Railway Children as we pass.

BBC: The wonders of Canada by rail

Hospitals have local oligopolies or even monopolies, especially after a recent wave of consolidation, so price competition is rare.

ECONOMIST: Health insurance: Clear diagnosis, uncertain remedy | The