举个简单的例子，想想两个人跳华尔兹，或者弹钢琴二重唱。
As simple examples, think of two people waltzing, or playing a piano duet.
他听见一个尖细的重声在歌唱：“带我跳华尔兹吧，威利，一圈一圈又一圈地跳呀。”
From far off he could hear a childish treble singing: "Waltz me around again, Willie, around, around, around.
那些老换工作、跳来跳去，没有明显进步的人，长寿的概率——比其担子日重的人——要低。
Those who moved from job to job without a clear progression were less likely to have long lives than those with increasing responsibilities.
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