There are a few things you should check before pressing the shutter release.按下快门之前有几个地方要检查一下。This device screws into the shutter release button.这个装置能旋进快门释放按钮。His finger was poised on the camera's shutter release.他的手指放在了相机的快门按键上。He racked his camera and pressed down the shutter release.他将照相机的焦距调好，然后按下快门。