求翻译：up to the end of 1993 when the tax credit eligibility period expired. Since then, substantial additional development has occurred是什么意思？

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悬赏分：1 - 离问题结束还有

up to the end of 1993 when the tax credit eligibility period expired. Since then, substantial additional development has occurred

问题补充：

匿名	2013-05-23 12:21:38 到1993年底的税收抵免资格期满时。自那时以来，发生了大量的额外发展

匿名	2013-05-23 12:23:18

匿名	2013-05-23 12:24:58

匿名	2013-05-23 12:26:38 1993 年时月底在税收信用资格期已过期。自那时以来，发生了大量增加发展

匿名	2013-05-23 12:28:18

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