新奇的日用产品无风叶的电扇：由美国研制的这种电扇，是由压电陶瓷夹持金属片，用交流电驱动来代替叶片送风，就好像人们用扇子扇风一样。这种电扇体积小、重量轻、耗电省、寿命长。无话筒的电话：美国生产出一种无话筒电话。它使用简单，一声“喂”就能接通。人们可在房... Novelty products for daily use Fanless fan: The electric fan developed by the United States is a piezoelectric ceramic that holds a metal sheet and uses an alternating current drive instead of a blade to send air, just as people use a fan to fan the wind. This kind of fan is small in size, light in weight, saves power, and has a long life. Phone without microphone: The United States produces a microphoneless phone. It is simple to use and can be switched on with a “hello”. People can be in the house...