在适当环境下，炭疽孢子可以存活数十年，所以，没有病例并不等于说没有危险。
Anthrax spores7 can remain viable for several decades under suitable environmental conditions; thus, absence of cases does not equate to absence of risk.
如果，如许多科学家所相信的那样，生命能够在适当的环境条件下迅速出现的话，很可能地球上不再只一次出现生命。
If, as many scientists believe, life can readily emerge under the right environmental conditions, it is possible that life arose on Earth more than once.
很多人可能难以接受这种说法：几乎每一个人，不管其遗传基础如何，在适当的环境下都可能上瘾。
And that's a notion many find hard to believe: Just about anyone, regardless of baseline genetic risk, can become an addict under the right circumstances.
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