去年四月，当我回到那儿，这条龙的头部由于不明原因而倒塌了。
When I returned there last April, the dragon's head has collapsed for unknown reason.
但由于一些不明的原因，身体发现这蛋白有点不妙。
But for some unclear reason, the body looks at the protein and sees Trouble.
但由于一些不明的原因，身体发现这蛋白有点不妙。
But for some unclear reason, the body looks at the protein and sees Trouble.
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