pH

The pH of the swimming pool must be tested daily to ensure the water is safe for swimmers.

(Chinese) 必须每天检测游泳池的pH值，以确保水质对游泳者是安全的。

Gardeners often check the soil pH to see if it is too acidic for growing specific types of flowers.

(Chinese) 园丁经常检查土壤的pH值，看看是否因为酸性过强而不适合种植某些花卉。