They worried about the purity of tap water.
他们担心自来水是否洁净。
Only when the water has been leached almost to purity does growth cease.
只有当水已经被过滤的时候几乎对纯净做生长停止。
Complete subboiling system for production of high purity acids and water;
亚沸设备，用于提取高纯度的酸和水。
Complete subboiling system for production of high purity acids and water;
亚沸设备，用于提取高纯度的酸和水。
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