后来，供暖系统进行了改进。

Later, the heating system became a little different.

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提出了一种新的无线数传系统，并对现存的无线数传系统进行了改进。

A new radio data transmission system is introduced, which improves the existing radio data transmission system.

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在分析隔膜式计量泵隔膜片损坏原因的基础上，对该泵的补油系统进行了改进。

Some improvements of the slippage systems of the daiphragm meter pumps were made based on the damage causes of the daiphragm sheets.

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