既然色素的专利早已过期，生产厂家本身也没有动力来资助这样的研究。
And since the patents on the dyes expired long ago, manufacturers have little incentive to finance such research themselves.
有些校样早已过期，她叫大卫打电话向印刷厂了解一下耽搁的原因。
Some proofs are overdue and she tells David to telephone the printers to find out the reason for the delay.
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