grin v. 露齿而笑，咧着嘴笑

　　beam vi. 照射；堆满笑容

　　laugh v.哈哈大笑

　　register vt.表示，表达; （感情） 流露;

　　如果单纯从中文的翻译还是很难深刻理解这几种笑的不同，可以在文章当中借助句意及语境再次感受下。

　　Seven Good Reasons to Smile

　　By Jennipher s, Health and Fitness Writer

　　Smiling happens without much thought. When you watch a friend do something silly or embarrassing, you smirk. When a police officer lets you off without a ticket, you grin. And when you are recognized for your top performance in academics or at work, you beam. Smiling is a very natural response that shares our happiness with others.

　　But did you know that smiling also triggers activity in your brain? Yep, there's a serious mind-body connection there, in your left frontal cortex to be exact, which is—not surprisingly—the area of your brain that registers happiness.

　　How often do you smile in a day? Do you smile when you meet new people? When you see your friends? Around your co-workers? How about your significant other? Your face has 44 muscles in it that allow you make more than 5,000 different types of expressions, many of which are smiles. Read on for seven reasons why smiling is good for you, your health and your social life!

　　1. Smiling can make you happy (even when you're not).

　　2. Smiling can make others happy.

　　3. Smiling makes you more attractive.

　　4. Smiling can help you de-stress.

　　5. Smiling can help you land a job.

　　6. Smiling can lead to laughter.

　　7. Smiling just feels good.

　　微笑的七个理由

　　微笑时不用想太多。当你看到一个朋友做一些愚蠢或尴尬的事情，你会傻笑。当一位警官没开罚单给你放行，你会咧嘴一笑。当你被公认为工作或业界的最高水平的时，你会面露喜色。微笑是当我们与他人分享快乐时一种非常自然的反应。

　　但是你知道微笑也能激发大脑的活动吗？是的，确切来说，在你的左额叶皮质中存在着大脑和身体的链接，这部分大脑区域产生快乐，并不奇怪。

　　你一天微笑多少次？当你遇到新朋友的时候你会微笑吗？当你看到你的朋友？在你同事周围？你的另一半？你的脸上有44块肌肉，你可以做5000多种不同的表情，其中很多是微笑。

　　请继续读关于为什么微笑对你，你的健康和你的社交生活都有好处的七个理由。

　　1. 微笑可以让你快乐（即使你不快乐）。

　　2. 微笑能使别人快乐。

　　3. 微笑让你更迷人。

　　4. 微笑能帮你减压。

　　5. 微笑能帮你找到工作。

　　6. 微笑能引起笑声。

　　7. 微笑就是感觉很好