回答
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Things you don't understand are things you look into.
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If you don't understand something, do research on it.
上記の1番目は直訳で、2番目はもっと自然な英語の表現です。(1番目は分かりやすいですが、あまり誰も言わないと思います。)
回答
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Things not understood are things to be researched
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Things not understood can be understood
直接的通訳するとこんな感じかな。英語でいうけど、A lot of people get scared of the unknown, therefore they dont try to understand. But in this era of the internet, there is somebody somewhere who may know an answer. 俺はよく信じてきたのはThere is no more mystery. And if we dont know, we can find out. 頑張ってくださいね!