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The train slacked up as it came into the station.
列车进站时减了速。
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The doctor advised Facer to slack up for few days, as his lifestyle was having a bad effect on his heart.
医生劝告费塞放松几天, 因为他的生活方式对他的心脏产生了不良影响。
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Slack up the tent ropes before it rains.
在下雨之前把帐篷的绳子放松。
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Please slack up your speed.I can't run as fast as you!
请你跑慢点!我跑得没你快。