The sparrow may be small, but it has all its vital organs. (Small but complete.)
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culture
The proverb 麻雀虽小,五脏俱全 is commonly used to describe something small but complete in every aspect. In some dialects (especially Cantonese), 麻雀 also means mahjong — the game's name 麻将 (májiàng) may derive from this.