pH 7标准液 pH 7 Standard
ph 7
ph值7
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Thomas Lachocki, the CEO of the National Swimming Pool Foundation, says that in order to be properly chlorinated, pools should contain 1-4 parts per million of chlorine and pH levels should be within 7.2--7.8.
CNN: Yuck! What's in your pool water
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