1、
2、
3、
Hence the copper/ zinc ratios were very significantly greater in the PEOM group ( p < 0.01).
前者铜/锌比率明显高于后者（p<0.01）。
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4、
Eternity and moment, weakness and toughness are two paradoxes mentioned in the peom.
永恒与短暂，脆弱与坚强，文中多次提及这两对矛盾。
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5、
