（然而，在其他领域他出版了好几本书，其中包括关于现存的以及灭绝的藤壶的详尽研究）之后，在那年的六月，达尔文收了一个名叫阿尔弗莱德.鲁塞尔.华莱士的年轻人的包裹。

He had, however, published books on several other subjects, including an exhaustive study of barnacles, both living and extinct.

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签名价格“基于市场行情”。弗莱德·凯姆·鲍尔，凯姆·鲍尔倡议管理处(这些公司中历史最长的)总监说。

Signature pricing is "based on market conditions," says Fred Kimball, the boss of Kimball Petition Management, the oldest of these firms.

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研究报告的主要撰写者、比利时国家科研基金会的埃尔弗莱德·伯纳德说，罪魁祸首可能是清洁公共浴池所用的氯产生的一种化学物质--三氯胺。

The lead author, Alfred Bernard of Belgium's National Fund for Scientific Research, said a possible culprit was the chemical trichloramine, a by-product of the chlorine used to clean public pools.

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