目的：评价轻舒颗粒治疗便秘(肾虚精亏证)的疗效与安全性。
Objective: To evaluate the efficacy and safety of Qingshu Granule on constipation (syndrome of kidney deficiency and damage of essence).
容重轻，颗粒强度低，本身有较好的热工性能，但在砂浆搅拌过程中容易破碎，会很大程度降低其热工性能。
Low density, low particle strength, good thermal property itself, but break easily while mixing, and reduce thermal property.
泡沫颗粒或者纤维因它们的绝缘性能和重量轻常用作填充物。
Foam particles or fiberfill usually make up the filler due to their insulating properties, without weight.
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