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它们比标准的外科口罩或有时建筑工人使用的防尘口罩要有效得多。
They are much more effective than the standard surgical masks or dust masks that are sometimes used by builders.
youdao
-
它们比标准的外科口罩或有时建筑工人使用的防尘口罩要有效得多。
They are much more effective than the standard surgical masks or dust masks that are sometimes used by builders.
youdao