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sky hole
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sky hole
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sky hole
天坑
具有巨大的容积,陡峭而圈闭的岩壁,深陷的井状或者桶状轮廓等非凡的空间与形态特质,发育在厚度特别巨大、地下水位特别深的可溶性岩层中,从地下通往地面,平均宽度与深度均大于100米,底部与地下河相连接(或者有证据证明地下河道已迁移)的一种特大型喀斯特负地形。
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retinoblastoma protein
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retinoic acid
retinoic acid receptor
retinoic acid syndrome
retinoid
retinol
retinol equivalent
retinopathy of prematurity
retinophora
retinoscope
retinoscopy
retinula
retinyl palmitate
retinyl palmitate; vitamin A palmitate
Retire
retired servicemen medical insurance
retired servicemen old-age insurance
retirement
retirement age
retirement syndrome
retirement system
Retirement System for the Employees of Public Institutions
Retiro Park
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