名詞 expert:

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

形容詞 expert:

1. having or showing knowledge and skill and aptitude
   同義詞：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.
   她是個(gè)有聲望的專家。
3. He has no pretensions to being an expert on the subject.
   他并不以這方面專家自居。
4. The expert is writing a theatrical review.
   專家正在寫戲劇評(píng)論。
5. To her expert eye, the painting was terrible.
   她以內(nèi)行的眼光看，這幅畫糟透了。
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.
   他是知名的金融專家。
8. According to expert opinions, they gave up the experiment immediately.
   根據(jù)專家們的意見(jiàn)，他們馬上放棄了這項(xiàng)試驗(yàn)。

ex.pert

n.（名詞）
A person with a high degree of skill in or knowledge of a certain subject.
專家：在某一科目中具有豐富知識(shí)或高度技巧的人

The highest grade that can be achieved in marksmanship.
特等射手級(jí)：在射擊術(shù)中可以取得的最高等級(jí)
A person who has achieved this grade.
特等射手：取得這種等級(jí)的人
adj.（形容詞）

Having or demonstrating great skill, dexterity, or knowledge as the result of experience or training.See Synonyms at proficient
熟練的：作為經(jīng)歷或訓(xùn)練的結(jié)果而具有或展示出豐富技能、技巧或知識(shí)的參見(jiàn) proficient

來(lái)源：
Middle English
中古英語(yǔ)
from Old French [experienced]
源自 古法語(yǔ) [經(jīng)驗(yàn)]
from Latin expertus [past participle of] experoro [to try] * see per- 3
源自 拉丁語(yǔ) expertus [] experoro的過(guò)去分詞 [試] *參見(jiàn) per- 3

【引伸】
ex.pert.ly
adv.（副詞）
ex.pert.ness
n.（名詞）