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Meaning of 燕子衔泥垒大窝

Lookup via: Pinyin | Radicals
燕 yàn 子 zi 衔 xián 泥 ní 垒 lěi 大 dà 窝 wō (Trad.: 燕子銜泥壘大窩)
the swallow's nest is built one beakful of mud at a time (idiom); many a little makes a mickle