n.手电筒；闪光灯
I signaled to them with a flashlight. 我用手电筒向他们发信号。
He took a flashlight lest it should get dark before he returned. 为了预防回来以前天就黑了，所以他带着手电筒。
You can use the flashlight when you take a photo indoors. 在室内拍照时可用闪光灯。
