In order to effectively sell a product or service, you must be passionate about it.

要实现高效地出售产品或服务，您必须对其抱有热忱。

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You must be passionate about the vision of 2012 and want to actively help work towards it.

你必须对于2012的愿景具有热情，想要积极地为此工作。

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User experience - Last but not least the Product Manager is the voice of the user inside the business and must be passionate about the user experience.

最后一项要点是，产品经理在商业领域就是用户的代言人，他必须对用户体验保持热衷。

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"A watchmaker must be passionate, " says the youngest of the bunch, Candaux, 32, who may also be the most conservative.

WSJ: Keeping Time With Master Watchmakers

You must be passionate about what you are trying to achieve.

FORBES: Naveen Jain - Top Ten Lessons for an Entrepreneur

For we must be as persistent and passionate in our pursuit of progress as any who would stand in our way.

WHITEHOUSE: Signing of New START Nuclear Arms Treaty with Russia