| Front | 왜냐하면 그것은 오염된 물을 마시기에 충분하도록 인류가 모여 살았던 수천년 전부터 존재해 왔기 때문입니다. |
|---|---|
| Back | because it's been around for thousands of years, ever since humankind really lived side by side enough to have really polluted water. |
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