useful怎么读

useful英 ['juːsfʊl; -f(ə)l]美 ['jusfl]adj. 有用的，有益的；有帮助的 [例句]All of these are quite useful breeds whose potentiality has not been realised.所有这些都是十分有用的品种，其潜力还没有被充分发挥出来...