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(1)香烟里到底有多少有害物质? 香烟中含有4 000多种不同的化学品,其中40种会致癌,而被证实有毒的则多达400种,比如苯、砒霜等。
(1) How many harmful substances do cigarettes have? Cigarettes contain more than 4,000 different chemicals, 40 of which are carcinogenic and up to 400 are toxic, such as benzene and arsenic.