• 1. Contract relax: 收缩椝沙郏 | 缩椝沙郏
• 2. contract-relax: 放松技术

• 1.By this time, the heart's electrical signal has passed from the atria into the ventricles, so while the atria relax, the ventricles contract.
  这个时候，心脏发出的电信号从心房传到心室，所以当心房放松时，心室就收缩。
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• 2.It takes diligence to identify your pelvic floor muscles and learn how to contract and relax them. Here are some Pointers.
  找到盆底肌的位置，学会如何收缩和放松肌肉，不断地练习让自己熟练掌握这一技巧。
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• 3.Researchers said: 'Once the ink on the marriage contract dries up, they relax the control they had on their weight and appearance.'
  研究者说，“结婚证上的签字刚刚晾干，夫妻俩就不再强调要保持体重和外表了。”
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