我们必须冒险
在这个世界上我们必须冒险，有的时候值得冒险，有的时候划不来，但我现在告诉你，要是你不会尝试， 你永远不会知道！
In this world we have to take chances, sometimes they're worth it and sometimes they're not, but I'm telling you now, you will never know until you try!
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Corrections · 3
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In this world we have to take chances, sometimes they're worth it and sometimes they're not, but I'm telling you now, you will never know until you try!
在这个世界上（，）我们要勇于尝试/ 敢于冒险；/。有时候（它们）值得一试，有时候不。但我要告诉你，不试，你（就）永远不会知道（答案）！
（"划不来" is kind of too conversational. While others of your words are formal. ）
I would write it like this.
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在这个世界上我们必须冒险，有的时候值得（冒险）（这里把"冒险"去掉是不是好点呢？"冒险"有点重复），有的时候划不来，但我现在告诉你，要是你不（会）（改成"去"比较好）尝试， 你永远不会知道！
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你的中文又进步了。＾ ＾
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