the subtitles are helpfully conveyed. 副标题有利于传达文章的内容。
The porter brings your bags to your room and helpfully explains how to access CNN. He shows you how to turn on the lights and adjust the air?conditioner.” 行李员把你的行李搬到房间，然后开始告诉你解释如何收看cnn，告诉你怎么开灯，怎么把空调调好。
