日本人は他の人を励ます時に、よく「頑張れ！」や「頑張ってください」といいますね。「頑張れ！」は英語で下記のような様々な言い方があります。場面に応じて、選択して使ってください。
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Come on! (主にスポーツの時に使う)
Cheer up! (「元気だして!」 相手が落ち込んでいる時に使う。)
Go for it! (目標に向かって頑張れ!)
Good luck! (頑張れ！うまくいきますように)
Keep up the good work. （この調子で頑張れ！）
Keep it up. (がんばり続けて!)
Keep going. （頑張れ！このまま続けて！)
Hang in there. （こんな状況だけど,諦めずに頑張れ！）
Don’t give up. （頑張れ、諦めるな！）
Do your best! (全力をつくせ！頑張れ！）
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Notes:
rough diamond ダイヤモンドの原石;
Crown Jewels 《英》 (戴冠式などの時々に国王[女王]が用いる王冠など王位の象徴の)宝器類;
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How much does it cost to buy one of the world’s biggest diamonds? Lesedi la Rona is the name of a rough diamond that is the size of a tennis ball. It went on sale yesterday at an auction, but no one wanted to pay more than $61 million. The sellers didn’t want to sell it at that price, so it is still for sale. If you want it, you will probably have to pay more than $70 million! What happens to such a large diamond? The largest diamond ever found was the Cullinan. That was more than 100 years ago. The diamond was broken down into smaller diamonds for the Crown Jewels of the U.K. (by Prof.Douglas Jarrell)
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(photo from http://www.bloomberg.com/)