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It's all water under the bridge now.

这已是过去的事情了。

Peter Dingle, an environmental toxicologist at Murdoch University in Perth, Australia, said he was mystified why milk powder was so popular in China.

澳大利亚珀斯默多克大学的环境毒物学家彼得·丁格尔说，他对奶粉在中国如此流行感到费解。