走廊空无一人，他们在那里尽兴地跳了一曲波尔卡舞。 劳里跳得很好，他教乔跳德国舞步，这种舞步活泼轻快，乔十分喜欢。
The hall was empty, and they had a grand polka, for Laurie danced well, and taught her the German step, which delighted Jo, being full of swing and spring.
这些衣着华丽的机器人能预判舞伴的舞步，从而跟随舞伴起舞。
They can predict the movements of a partner, enabling them to follow another dancer's lead.
年轻人跳起来，从头上脱下帽子交到人群中，并跳着舞步穿过人群。
He gestured threateningly at the young man, who leapt to his feet, took his hat from his head and passed it into the crowd. He proceeded to give chase as the young man danced through the crowd.
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