几乎半数的世界人口都依靠生物质燃料——木材，牛马粪便和农业废料等——来完成如煮饭，干燥农作物，净化水等日常生活活动。
Approximately half of the world's population relies upon biomass fuels - such as wood, dung and agricultural wastes - for everyday tasks such as cooking, drying crops and purifying water.
所以提高编辑素质，使编辑活动规范化、制度化，能对治理当前的学术腐败，净化学术环境发挥重要的积极作用。
Therefore, to raise the quality of editing and make editing activities standardized can play an important positive role to treat the current academic corruption and purify academic environment.
购物也被视为泻药活动，净化你所有的负面情绪。
Shopping is also deemed as cathartic activity, purging all your negative emotion.
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