PC board modify fluid is a kind of colorless lit liquid, ph neutral, non-toxic, but has an impact type smell.

pc板修改液是一种无色通明的液体，酸碱中性，无毒，但有影响型的气味。

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Pure water is neutral with a pH of 7.

纯净水是中性的，PH值为7。

《柯林斯英汉双解大词典》

The new catalyst works at room temperature, in neutral pH water, and is easy to set up, Nocera said.

Nocera说，这个新的催化剂工作在中性pH和室温条件下，而且容易使用。

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They record an epoch before the Endeavour impact when there was aqueous activity at a near-neutral pH.

BBC: Opportunity and Curiosity find similar rocks on Mars

The rock that Curiosity found, on the other hand, has calcium sulfate and seems to have been in water with a neutral pH.

CNN: NASA: Yes, Mars could have hosted life