invent；find；find out; discover 区别
invent；find；find out; discoverinvent意为“发明”，指通过劳动运用聪明才智“发明／创造”出以前从未存在过的新事物。
Who invented the telephone？ 是谁发明电话的？
He invented a new teaching method．他发明了一种新的教学方法。
find意为“找到、发现”，指找到或发现自己所需要的东西或丢失的东西，着重指找到的结果。
We've found oil under the South Sea．我们已在南海发现了石油。
They finally found a way． 他们终于找到了办法。
discover意为“发现”，表示“偶然”或“经过努力”发现客观存在的事物、真理或错误，即指发现原来客观存在但不为人所知的事物，也可表示发现已为人所知的事物的新的性质或用途。
Columbus discovered America in1492．哥伦布1492年发现了美洲。
We soon discovered the truth． 我们很快就弄清了真相。
find out指经过研究或询问查明某事或真相。
I've found you out at last.我终于把你揭露了。
Please find out when the ship sails for New York.请打听一下那艘船什么时候开往纽约。
Please find out what time the delegation will come.请查一查代表团什么时候来。 Who invented the telephone？ Maybe you don't know.But you can find the answer in the internet. We need more time to find out many things sometimes, maybe another new things are discovered in this process. Thank you. I get it. I'd like to use "find out" personally.
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