Environmentalists are arguing in circles about who or what is to blame: the total number of people; or the amount of water, food, mineral ores or clean air each demands.
环境保护主义者关于人口问题的归责长期唇枪舌剑争论不休：人口总量即与之对应的供给人口需要的水、食物、矿产和清洁的空气总量等等。
Turbo air classifier is widely used to prepare powders in the fields of cement, mineral processing, chemical industry, food processing and medical industry.
涡流空气分级机是水泥、矿物加工、化工、粮食加工、食品、医药等行业粉体制备系统中非常重要的设备之一。
But it is easy to aging in the air, the heat variable viscosity, easy expansion in mineral oil or gasoline and dissolved, but not resistant to acid alkali.
但在空气中易老化，遇热变黏，在矿物油或汽油中易膨胀和溶解，耐碱但不耐强酸。
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