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三槽板间平面陶立克柱式雕带上两个三联浅槽间的空间面板强化，加硬处理，独面板三级台阶强化结构，加硬处理水槽更加平直，更具强度，更能载重。
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As his mother read it, her face hardened and became more expressionless.
母亲读信时, 脸沉了下来,变得更加没有表情.
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Dr. Meade bit his lip and his jaw hardened as his face went cool again.
米医生咬了一下嘴唇,随即面孔又变冷漠了,嘴边又出现强硬的样子.
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