zhè / gēn / lǎo / mù / tou / shàng / de / jié / liú / ràng / zuò / jiā / jù / de / shī / fu / hěn / tóu / téng这根老木头上的节瘤让做家具的师傅很头疼。The knot on this old log gives the furniture maker a big headache.