《史记·三十世家·绛侯周勃世家》
周勃靠编蚕箔维持生活，还常在人家办丧时事吹箫奏挽歌，后来又成为能拉硬弓的勇士。
勃以织薄曲为生，常为人吹箫给丧事，材官引彊。
Zhou Bo supported his family by making silkworm frames, and he often went to funerals to play the flute and sing funeral songs. Then he later became a fierce warrior that could pull hard bows.