The first is to reduce the number of lines that appear in the dropdown.

第一，出现在下拉栏中的行数。

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Routine change of central lines has not proven to reduce infection rates.

常规更换导管还未证明能降低感染率。

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Routine change of central lines has not proven to reduce infection rates.

常规更换导管还未证明能降低感染率。

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