[译] 钙的代谢不能与磷的代谢分割开来。
[误] Calcium metabolism cannot be separated from phosphorus.

[正] Calcium metabolism cannot be separated from that of phosphorus.
[注] 误句中 from 之后应为 metabolism of phosphorus, 代词 that 可以代替前面出现的单数名词；those 可代替前面出现的复数名词，以免重复。又如：Animal cells do not possess a definite cell wall like that seen in the cells of plants. 动物细胞没有分明的如植物细胞的那种细胞壁。