Turning his head at the sound of familiar footsteps, the grad student realizes that he did not properly lock the bathroom door.
听到熟悉的脚步声，博士生转过头，意识到自己没有锁好门。
Turning his head at the sound of familiar footsteps, the grad student realizes that he did not properly lock the bathroom door.
听到熟悉的脚步声，博士生转过头，意识到自己没有锁好门。
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