expertness in sth
expertness 通常作不可数名词，常用 in 引出所精通的领域。
Her expertness in negotiation quickly settled the dispute.
她在谈判方面的精通很快平息了争端。
熟练；精通
熟练；精通；专门技能；专门性
熟练；精通；专门技能
The state of being expert; proficiency or skill.
Her expertness in programming made her the lead developer on the project.
她在编程方面的专门性使她成为该项目的首席开发人员。
用法提示：expertness 作为名词，表示在编程领域经过实践获得的专门技能。
The chef's expertness in French cuisine was evident from the first course.
这位厨师在法式烹饪方面的专门性从第一道菜就显而易见。
用法提示：expertness 强调通过练习获得的烹饪专门技能。
Years of practice gave him an expertness in playing the violin that few could match.
多年的练习使他在小提琴演奏方面具备了很少有人能比的专门性。
用法提示：expertness 指通过长期练习达到的演奏专门技能。
expertness 通常作不可数名词，常用 in 引出所精通的领域。
Her expertness in negotiation quickly settled the dispute.
她在谈判方面的精通很快平息了争端。
可与 show、demonstrate 等动词连用，强调所表现出的熟练程度。
The young surgeon showed remarkable expertness in handling the emergency.
这位年轻外科医生在处理急诊时表现出非凡的娴熟。
of 短语用来说明熟练所体现的对象或范围。
The expertness of the craftsman's work was obvious to every visitor.
这位工匠作品的精湛对每位参观者来说都显而易见。
with expertness 作方式状语，意思接近 skillfully，但语气更书面。
She guided the boat through the narrow channel with expertness.
她娴熟地引导小船穿过狭窄的航道。
grammar · medium
易错句子My uncle is a computer expertness.
正确表达My uncle is a computer expert.
expertness 是不可数抽象名词，表示“熟练、精通”这一性质，不能用来指人；指“专家”要用 expert。汉语“专家”只有一个词，学习者容易把带 -ness 的名词直接当成人来用。
grammar · medium
易错句子She is very expertness in math.
正确表达She is very expert in math.
very 修饰形容词，且此处需要形容词作表语；expertness 是名词，不能这样用，应改为形容词 expert（熟练的、精通的）。
grammar · medium
易错句子He showed great expertness at solving difficult problems.
正确表达He showed great expertness in solving difficult problems.
名词 expertness 表示“在某方面精通”时后接介词 in（expertness in doing sth）；at 是形容词 expert 的搭配（expert at），不能套用到名词上。
expertise 指在某领域内系统性的专业知识与技能，是日常常用词，常与 in 搭配；expertness 指“身为专家的状态或熟练程度”，极罕见，多用于抽象地谈资格或程度。
proficiency 强调可衡量的熟练水平，常见于语言或技能测试，常与 in 搭配；expertness 不表示可量化的水平，只笼统指“是专家”这一性质。
expert 指“专家”这一人物，是可数名词，可直接说 an expert；expertness 指“专精、熟练”的性质，不能用来指人。
n./adj.
noun
adverb
n./adj.
adjective
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