虽然美国某些地方天然含有硬水资源，但并不是全美所有地方都有硬水分布。

And while hard water occurs naturally in some parts of the country, it's by no means found in all of them.

youdao

虽然美国某些地方天然含有硬水资源，但并不是全美所有地方都有硬水分布。

And while hard water occurs naturally in some parts of the country, it's by no means found in all of them.

youdao