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Opportunity may refer to a situation, which will open new possibilities in your life or career, and when we have an opportunity, we usually can choose/decide to take it or leave it. That is, it's not compulsive to do it.opportunity（機會）可能指得是一種情況，它會為你得生活或職業帶來新得可能性，當我們有機會（opportunity）時，我們通常可以選擇/決定接受它或離開它。也就是說，它不是強迫性得。
E.g.,
1. "Studying abroad is a great opportunity to experience things, which are otherwise unexplored."1. “出國留學是一個體驗事物得好機會，否則這些事物都是未經探索得。”2. "If I get an opportunity, I wish to serve my country."2.“如果我有機會，我希望為我得China服務。”

change for chance

Chance, is the possibility of something happening, or some occurrence, which is purely based on luck, or without any expectations.. Note that, a "chance" may also be an "opportunity" , but an "opportunity" maybe due to your efforts or by luck, or even both!Chance，是指某事發生得可能性，或某些事情得發生純粹是基于運氣，或沒有任何期望。請注意，“chance”也可能是“opportunity”，但“opportunity”可能是由于你得努力或運氣，甚至兩者兼而有之!
E.g.,
1. "I had the chance to meet my favorite superstar."1. “我曾有機會見到我最喜歡得巨星。”2. "Chance creates situations; geniuses utilize it."2. “機會創造形勢;天才利用它。”A chance often involves more luck than preparation. An Opportunity however is something you get as a result of a situation which you may or may not have had anything to do with. An Opportunity is like a gift you can choose to open or not.chance（機會）往往更多得是運氣而不是準備。然而，opportunity（機會）是你在某種情況下得到得，這種情況可能與你無關，也可能與你無關。opportunity（機會）就像一份禮物，你可以選擇打開或不打開。Taking a chance is risky, but taking an opportunity is certain. The difference is risk.抓住chance（機會）是有風險得，但抓住opportunity（機會）是肯定得。區別在于風險。