门标志表示上紧快门弦后按下快门开始曝光松开快门钮快门不关闭需要再次按下快门钮才关闭快门
The door sign indicates that after tightening the shutter string and pressing the shutter, exposure begins. When the shutter button is released, the shutter does not close. You need to press the shutter button again to close the shutter
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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