毕竟，一次性尿片早在1940年左右就出现了。

After all, disposable diapers have been around since the 1940s.

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但是一次性尿片是我们找到的最实用的尿片了。

But it's the most functional diapers we've found.

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我们之前从没有做过清洗布尿片所耗费水量与一次性尿片的效果研究，但是小孩子会用很多尿片。

We never did do an impact study of water usage for cleaning versus disposable diapers, but babies use a lot of diapers.

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