更重要的是，美国将有更高的用水效率，所罗门说。

More important, the U. S. has become more efficient in its water usage, says Solomon.

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解答是，要改善目前用水的效率。

The answer is by improving the efficiency with which water is used.

youdao

解答是，要改善目前用水的效率。

The answer is by improving the efficiency with which water is used.

youdao