expert

名词 expert:

1. a person with special knowledge or ability who performs skillfully

形容词 expert:

1. having or showing knowledge and skill and aptitude
   同义词：adept, good, practiced, proficient, skillful, skilful

1. He is an expert on the world's mystical religions.
   他精通世界上的神秘宗教。
2. She is a reputable expert.
   她是个有声望的专家。
3. He has no pretensions to being an expert on the subject.
   他并不以这方面专家自居。
4. The expert is writing a theatrical review.
   专家正在写戏剧评论。
5. To her expert eye, the painting was terrible.
   她以内行的眼光看，这幅画糟透了。
6. He is an expert in unarmed combat.
   他是徒手格斗的能手。
7. He is an well-known expert in finance.
   他是知名的金融专家。
8. According to expert opinions, they gave up the experiment immediately.
   根据专家们的意见，他们马上放弃了这项试验。

ex.pert

n.（名词）
A person with a high degree of skill in or knowledge of a certain subject.
专家：在某一科目中具有丰富知识或高度技巧的人

The highest grade that can be achieved in marksmanship.
特等射手级：在射击术中可以取得的最高等级
A person who has achieved this grade.
特等射手：取得这种等级的人
adj.（形容词）

Having or demonstrating great skill, dexterity, or knowledge as the result of experience or training.See Synonyms at proficient
熟练的：作为经历或训练的结果而具有或展示出丰富技能、技巧或知识的参见 proficient

来源：
Middle English
中古英语
from Old French [experienced]
源自 古法语 [经验]
from Latin expertus [past participle of] experoro [to try] * see per- 3
源自 拉丁语 expertus [] experoro的过去分词 [试] *参见 per- 3

【引伸】
ex.pert.ly
adv.（副词）
ex.pert.ness
n.（名词）