expert

n.专家，能手 a.熟练的；内行的

expedite, expedition, expeditionary, expeditious, expeditiously, expel, expend, expendable, expenditure, expense, expense account, expensive, expensively, experience, experienced, experiential, experiment, experimental, experimentally, experimentation, expert cook, expertise, expertly, expertness, expiate, expiation, expiration, expire, expiry, explain, explanation, explanatory, expletive, explicable, explicate, explicit, explicitly, explicitness, explode, exploded diagram,