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selectivity of sth
表示某事物自身具有的选择性。
The selectivity of the catalyst is remarkable.
这种催化剂的选择性很出色。
选择性；选择度
selectivities — plural of selectivity
先理解核心含义，再看它在真实句子里的用法。
选择性；选择度
the quality of being selective; the ability to choose carefully among options
The selectivity of the catalyst is remarkable.
这种催化剂的选择性很出色。
选择性；可选择性程度。
The quality of being selective, or extent to which something is selective.
选择性
the property of being selective
无线电接收机将所需信号频率与其他频率分离的能力。
The ability of a radio receiver to separate a desired signal frequency from others.
反应物对多种反应物的选择性；不同反应物的速率常数比。
Discrimination of a reactant towards a choice of other reactants; the ratio of rate constants for different reactants.
The selectivity of the university's admissions process means only the top applicants are accepted.
这所大学招生过程的选择性意味着只有最优秀的申请者才会被录取。
This chemical method is valued for its high selectivity, so it reacts only with the desired compound.
这种化学方法因其高选择性而受到重视，它只与目标化合物反应。
A good search engine should offer both speed and selectivity so users find exactly what they need.
一个好的搜索引擎应当兼具速度和选择性，让用户准确找到所需内容。
表示某事物自身具有的选择性。
The selectivity of the catalyst is remarkable.
这种催化剂的选择性很出色。
表示对特定目标的选择性，常与 show 或 have 搭配。
The method shows high selectivity for the target molecule.
该方法对目标分子显示出高度的选择性。
表示在某方面或某过程中的选择性。
Selectivity in choosing candidates is essential.
在挑选候选人时，选择性至关重要。
Not this
The selective of this reaction is poor.
Use this
The selectivity of this reaction is poor.
selective 是形容词“有选择性的”，这里“the ... of”结构需要名词；应使用名词 selectivity。
Not this
We need to improve the selection of the catalyst.
Use this
We need to improve the selectivity of the catalyst.
selection 指“选择、挑选”，selectivity 才表示“选择性”（对目标产物的优先选择）。中文“选择性”不能对应 selection。
Not this
This method has big selectivity.
Use this
This method has high selectivity.
英语中 selectivity 常与 high/low 搭配，表示选择性“高低”；big/large 表示“大小”，搭配不当，也受中文“选择性大”的影响。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
高选择性
The catalyst shows high selectivity for the desired product.
该催化剂对目标产物显示出高选择性。
低选择性
Low selectivity makes this method unsuitable for separating similar compounds.
低选择性使该方法不适合分离相似化合物。
选择程度
The degree of selectivity depends on the reaction temperature.
选择程度取决于反应温度。
选择系数
The selectivity coefficient measures how well the sensor distinguishes between ions.
选择系数衡量传感器区分不同离子的能力。
Use selectivities naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
由 select（选择）联想：能精挑细选，就是 selectivity（选择性）。
语域：formal 常见场景：学术论文、化学/工程文献 selectivity 比较常见于正式或技术语境，多用于学术写作或化学等专业领域；日常口语中通常较少使用。
表示不同种类或程度的选择性时，可用复数形式 selectivities。
Dictionary facts from ECDICT, OCTANOVE, WIKTIONARY.