an unexplained occurrence that baffled everyone.
一件让人人感到困惑怪事。
an unexplained occurrence that baffled everyone.
一件让人人感到困惑怪事。
cot death is still an unexplained phenomenon.
婴儿猝死仍是一种无法解释现。
His unexplained absences fed our suspicions.
无故缺席引起了我们对怀疑
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