Some people keep the door closed while others keep it open.
有些人关着这扇门，而有些人则敞开着。
It is easy to keep a door closed that nobody knocks upon.
没有人敲的门很容易一直关着。
Keep the door closed. Don't open it.
让门关着，别打开。
Open the right hand door only. Keep the left hand door closed at all times.
只能打开右侧车门，并保持左侧车门全程处于关闭状态。
Be sure to keep the door closed before opening the window.
确定在打开窗户之前把门关紧。
Be sure to keep the door closed before opening the window.
确定在打开窗户之前把门关紧。
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