The soil amounts of microbial physiological group increased with vegetation restoration of degraded Karst, which indicated the soil quality has been improved gradually.

退化喀斯特植被恢复增加了土壤微生物生理类群数量，使土壤质量得以提高。

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Nor does empathy suggest a physiological "reason" for yawning (after all, we yawn when alone), though Dr. Provine thinks that it may be "a response to and facilitator of change in behavioral or physiological state, " maybe synchronizing a group of people about to embark on a behavioral transition.

WSJ: Matt Ridley on Why You Just Yawned | Mind & Matter