A pH test measures the acidity or alkalinity of a substance.pH值测试可检测物质的酸碱度。Add honey to counterbalance the acidity.加点蜂蜜来调和酸味。This plant prefers alkaline soil, though it will readily tolerate some acidity.这种植物在酸性土壤中也能生存, ...
唱歌的四个声部是女高音 、 女低音 、 男高音和男低音.The four parts in singing are soprano, alto, tenor and bass.那位男低音歌唱家将在公园中举行音乐会.The bass was to give a concert in the park.你唱男低音还是男中音?Do you sing bass or baritone?...