“When you have been searching where is an (x object) after surviving 4 hours of game” (can you tell me what is wrong with this sentence?) 这个在 英语 (美国) 里怎么说？

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Saying "searching where is" is redundant because "searching" implies you are searching for the location of something.

"4 hours of game" should be "4 hours of a game". Also, it would be more natural to say "surviving 4 hours in a game". Because that implies that you have survived as a character inside the game.

So as an example, your sentence would be better said: "When you have been searching for an (x object) after surviving 4 hours in a game"