back and forth 来来回回的; flesh and blood 血肉之躯; heavy and light 轻重; iron and steel 钢铁; night and day 夜以继日的; off and on 断断续续的; old and young 无论老少; one and only 唯一; rain or shine 不论阴晴; twos and threes 三三两两
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