中英释义：
双语例句
一个情人节的故事改编自民间故事的起源不明。
A Valentines' Day story adapted from a folktale of unknown origin.
重点词汇
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起源
origin; source; birth; beginning; genesis; provenance; root; derivation; appearance; seed; pedigree; originate; derive; stem; rise; arise; start; stem from; -head
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不明
unknown; unclear; obscure; indistinct; vague; ambiguous; unexplained; undefined; murky; dim; faint; hazy; nebulous; indeterminate; veiled; dark; dull; fuzzy; do not understand; be not clear