Why do we yawn? HSK 6 打哈欠是人类的一种本能行为 Yawning is an instinctive act of mankind

Name: Why do we yawn? HSK 6 打哈欠是人类的一种本能行为 Yawning is an instinctive act of mankind
Uploaded: 2017-10-07T01:53:40+00:00
Duration: 7 min 2 s
Channel: Legoo Mandarin Online Learning School
Description: HSK 6 Intensive Reading Full course is ready! http://edeo.biz/4882 (60 HD Videos, Total 16 Hours ) <br />You can use “youtube30” to get 30% off, Grab it! <br /> Thanks for your support for us to creating better contents for you!

Legoo Mandarin Online Learning School

HSK 6 Intensive Reading Full course is ready!  http://edeo.biz/4882    (60 HD Videos, Total 16 Hours )  You can use “youtube30” to get 30% off, Grab it!   Thanks for your support for us to creating better contents for you!

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