The researchers aren't sure exactly how dangerous the particles are, nor do they fully understand their potential relationship to tobacco smoke.

研究者们还不能非常确定这些颗粒有多大危害，也不完全明白这些颗粒的危害与吸烟的潜在关系。

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They are honest about the relationship real consumers have with your brand, say something dangerous or provocative.

敢于坦诚于你的产品(或品牌)和他的消费者的关系，可能是危险的或者是挑衅的。

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If you compete with your spouse, a sibling or a friend: you're playing a dangerous game that will damage your own self-esteem, and tear your relationship apart.

如果你和配偶、和弟兄姊妹或和一位朋友去竞争：你就在做着一个会有损自尊、破坏你们关系的游戏。

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She gets work as a lifeguard and starts a dangerous relationship with a troubled teenager.

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The availability of an independent credit card may represent her best chance at establishing independence and a path out of a dangerous relationship.

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Rihanna told "Good Morning America" that Brown was definitely her first love, but that the more in love they became, the more dangerous the relationship turned.

CNN: Rihanna speaks: 'Love is so blind'