"As a result, some people believe that e-cigarettes are a safe substitute for conventional cigarettes," said Prue Talbot, the director of UC Riverside's Stem Cell Center, whose lab led the research.

加利佛尼亚大学干细胞研究中心主管，他的实验室正在进行此项研究。他说：“正因为如此，许多人认为电子烟是安全的，完全可以替代传统香烟。”

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It can be compared to a car seatbelt-a precaution, but no substitute for safe driving.

这可以同轿车安全带相类比——是一项预防，但它并不能取代安全驾驶。

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Microbial preservation technology, a new hopeful substitute of traditional technology in food preservation has been confirmed to be a natural, safe, residue free, and highly efficient method.

传统的食品保鲜技术将逐步被一种全新、无毒、高效的保鲜技术-微生物保鲜技术所取代。

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We said two years ago that when a safe substitute is found we would move to it.

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But there were several chances for the home side to make the game safe, substitute Kenwyne Jones completely missing his kick in front of goal and Zenden seeing two efforts blocked.

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The company has run trials showing that the drug is safe and a faster substitute for conventional injectable therapies.

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