为了研究这种性能，许多年来一直采用传统的长期试验方法。

To study this property, a long-term test method has been used for many years.

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多年来，他就赞成禁止核试验这种想法。

He had been sympathetic to the idea of a test ban for some years.

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多年来，他就赞成禁止核试验这种想法。

He had been sympathetic to the idea of a test ban for some years.

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