Facial expressions aren't as important in live performances generally, because the choreographer knows that someone in the back row of a theater may not be able to see a dancer's face clearly.
面部表情在现场表演中通常不那么重要，因为编舞者知道坐在剧院后排的人可能看不清舞者的脸。
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British author and speaker Sir Kenneth Robinson talked about this at TED. He told the story of Gillian Lynne, a dancer and a choreographer (编舞者) who has worked on famous musicals like Cats and Phantom of the Opera (《歌剧魅影》) .