在那之后，还对Swing进行了多次改进。

Since then, there have been many improvements to Swing.

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在 70 年代，UNIX 经过许多次改进，逐渐流行起来。

Through the 1970s, UNIX went through many iterations and steadily gained popularity.

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根据坎杜堆多年的运行经验，其蒸汽发生器设计经历了多次改进。

These generators which have evolved out of the years of operating experience in CANDU.

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