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You must shoot with an exposure of at least four to 10 seconds to capture the trails of light, and your images will be blurry if the camera is held by hand.
要向捕捉光的轨迹，你必须让相机曝光4到10秒；而如果你把相机放到手上去拍摄的话，你的照片会很模糊。
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