perplexing

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导读:雾霾已经成为困扰中国大多数城市的严重问题。清华大学研究人员通过实验，发现了雾霾形成物硫酸盐的独特形成模式。Scientists said Wednesday they have solved the perplexing puzzle of how a major smog component, known as sulf

浩繁的英文：vast and numerous参考例句：The expenses are perplexing.费用浩繁。Expenditure is multifarious用度浩繁Administration expenses are perplexing.政费浩繁。He can not bear the heavy expenditure.浩繁的开支,使他难以承