1.alarm 是名词,警报,报警器,恐慌eg.give the alarm 发警报Small earthquakes are so common here that people don't feel much alarm at them.地震在这里是常见的事,人们并不为此而大惊小怪.2.warn 是动词,告诫,警...
报警器:alarm自动报警设备:automatic alarm device助动车有自动报警装置,只要一触动就运作automatic alarm device (for automobiles), which goes off when triggered如果你这里的助动车就是说的汽车,上面的for automobiles就正确,第一次听说这种助动车,中文跟不上发展了