在自动模式和程序模式当中，相机自己会决定快门速度。

In auto mode and program mode, the camera decides what shutter speed is needed.

youdao

实际上，当你按下快门时，一套复杂的程序开启，包括镜头内光圈的设置、一块单镜头反射镜的升起和其他更多的步骤。

When you press the shutter release on the camera, a complex sequence of events occurs, including setting the aperture in the lens, flipping up the mirror of an SLR and a lot more.

youdao

用手机控制照相机的闪光灯、5倍变焦镜头和快门简直让人啼笑皆非，还要让手机给这些照片贴上地理标签，并且在手机上切换程序每次都会切断两者之间的连接。

It was a neat party trick to control the camera's flash, 5x zoom and with the phone -- and to have the phone geotag those pictures -- but switching apps on the phone disconnected the two every time.

youdao