leptonn.
英 'leptɒn
中文n. 轻粒子（希腊的货币单位，古希腊的最小硬币）
词根词源
lepton (n.)elementary particle of small mass, 1948, from Greek leptos "small, slight, slender, delicate" (from lepein "to peel," from PIE *lep-; see leper) + -on. Also the name of a small coin in ancient Greece, from neuter of leptos
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