n.光(电)耦合器

CTR Technological Controlling on Photo Coupler 反射式光耦的CTR工艺控制

Keep the sun behind you when you take a photo. 拍照时要让太阳留在你的身后。

He showed me a photo of a family group. 他给我看一张合家欢的照片。

Many a time have we come across this same photo. 我们多次都见到过这同一张照片。

He adjusted the shutter before taking a photo. 在照相前，他调整了快门。

The woman on the photo is my paternal grandmother. 照片上的这个妇人是我祖母。