【Native Speaker每日综合训练—45系列】【45-09】科技 E-Cigarette

apooolo

warm up 243 2'04 118wpm
e-cigaratte release nicotine, maybe it is not so healthy as it claims.
2# 364
e-cigaratte contains what kind of harmful materials. a lot of people, especially young persons taste it.
3# 313 2'14 139wpm
calls about the solutions with vapor of e-cigarattes increases. they are designed to attract kids, by tasting and appeal. they can not get away with it.
4# 332 2'26 138wpm
scientists research the vapor of e-cigarattes, more health risks are found.
5# 297 1'33 191wpm
may be surpurised, but the vapor contains some materials very toxic. what's the reason? somehow because of the high temperature of the vapor.
6# 297 1'57 150wpm
more research on the vapor of the e-cigarattes, the mass and dirmeter of the particles they will deposit in lung. the result, they are possibly no better than normal cigarattes.
obstacle 1527 11'41 130wpm
summary the research on vapor of e-cigaratte, it contains sereval materials and ti is pretty harmful. more and more young perosns are trying this products. the economy behind e-cigaratte, some investors gamble on the business. whether it is safe is hazy.