The longer that unproven therapies stay on the market, the greater is the risk that a history of use can be framed as evidence of safety and efficacy.

未经检验的干细胞疗法在市场上停留的时间越长，那些使用历史被做为其安全性和有效性的证明的风险就越大。

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The fact that the two vessels did sink is an unalterable fact of history, and while ship design and safety protocols have changed, the powder-keg nature of human behavior is the same as it ever was.

两艘船确实沉没了的事实是不可改变的历史事实，虽然船的设计和安全条款已经改变，但是，人类行为的火药库本质一如既往，没有改变。

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Not as well-kept a secret as in years past, Granada is becoming a more popular destination for tourists due to its history and relative safety.

几年前，它还像是个保守得很好的秘密，但是现在，格拉纳达因其历史和相对而言的安全原因，正成为趋于热门的旅游目的地。

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Mister Strauss demanded the strongest safety protections in the history of bridge building.

VOA: special.2010.07.23

And the crisis has made Tepco's history of safety scandals highly visible.

FORBES: Magazine Article

In a written statement Thursday, Hyatt cited its "outstanding safety record" and history of strong relations with unions, and said it would continue to collaborate with federal regulators.

WSJ: Pritzker Choice as Commerce Pick Could Cause Rift

We also achieved the best safety record in our history.

FORBES: Uranium sell-off an overreaction