Apna Arts has achieved more with voluntary workers in three years than most organisations with paid workers have achieved in ten.“我们”艺术中心依靠志愿者在3年内取得的成就超过了大多数雇用受薪员工的机构10年中取得的成绩。...
Skin is naturally slightly acidic and has a pH of 5.5.皮肤具有天然弱酸性,pH值为5.5。A pH test measures the acidity or alkalinity of a substance.pH值测试可检测物质的酸碱度。Pure water is neutral with a pH of 7.纯水是中性的,酸碱度为7。...