undrinkable

adj.

不能喝的，不能饮用的；

1. The milk has already become undrinkable.
   牛奶已经不能喝了。
2. Some 70 percent of the earth's surface is water, but most of that is undrinkable seawater.
   的地球表面是水，但是它大部分是不能喝的海水。

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