You are given a sentence in English. Your job is to translate the English sentence into Japanese.
One example: And it was primarily because Kiribati realized that this was in their own self-interest to do this.
Solution is here: 第一にキリバス共和国が彼ら自身の利益になると理解したからです
Explanation: The English sentence is correctly translated into Japanese. Kiribati is correctly translated as キリバス.

Now, solve this: It's a fast, cheap device that answers an important question: Is this water contaminated?
Solution:
「この水は汚染されているか否か ？ 」という重要な問いに即座に答えてくれる安価なデバイスです