1
a subgroup of [noun]
subgroup 是可数名词，常后接 of 短语说明它所属的更大群体。
A subgroup of patients showed no response to the treatment.
患者中的一个亚群对这种治疗没有反应。
子群；小群；亚群
先理解核心含义，再看它在真实句子里的用法。
子群；小群；亚群
a group that is part of a larger group, often one that is distinct or subordinate
A subgroup of patients showed no response to the treatment.
患者中的一个亚群对这种治疗没有反应。
大群体中的子群体；成员属于较大群体但不全是的群体
A group within a larger group; a group whose members are some, but not all, of the members of a larger group.
群体中的一个独特且通常从属的小组
a distinct and often subordinate group within a group
群G的子集,本身是群且具有与G相同的二元运算
A subset H of a group G that is itself a group and has the same binary operation as G.
(数学)数学群的非空子集
(mathematics) a subset (that is not empty) of a mathematical group
The researchers divided the patients into a main group and a smaller subgroup for the trial.
研究人员将患者分成一个主要组和一个较小的子群进行试验。
Within the city's population, there is a subgroup of young adults who prefer online shopping.
在这个城市的人口中，有一个偏好网购的年轻成人小群体。
A subgroup of students in the class organized a weekly debate.
班上的一个学生小群体组织了每周一次的辩论。
subgroup 是可数名词，常后接 of 短语说明它所属的更大群体。
A subgroup of patients showed no response to the treatment.
患者中的一个亚群对这种治疗没有反应。
divide ... into subgroups 中 subgroups 常用复数；也可用 split ... into subgroups。
The facilitator divided the participants into subgroups for the discussion.
主持人把参与者分成几个小组进行讨论。
within a/the subgroup 是介词短语，常作状语，强调子群内部的情况。
The differences within the subgroup were surprisingly small.
该亚群内部的差异小得令人惊讶。
Not this
Subgroup is smaller than the whole group.
Use this
A subgroup is smaller than the whole group.
subgroup 是可数名词单数，在句中作主语时需要加限定词 a 或 the；汉语没有冠词，因此学习者容易漏掉。
Not this
There are many subgroup in this category.
Use this
There are many subgroups in this category.
many 后面要接可数名词复数，subgroup 的复数形式是 subgroups；汉语名词没有复数词尾变化，所以容易漏加 -s。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
亚组分析
The researchers conducted a subgroup analysis to check whether the effect differed by age.
研究人员进行了亚组分析，以检验该效应是否因年龄而异。
族裔亚群
The survey included every major ethnic subgroup in the region.
该调查涵盖了该地区所有主要的族裔亚群。
患者亚组
The drug was most effective in a patient subgroup with mild symptoms.
该药对症状较轻的患者亚组最有效。
人口亚群
The disease is rare in this population subgroup.
这种疾病在该人口亚群中很罕见。
年龄亚组
The results were consistent across every age subgroup.
结果在每个年龄亚组中都是一致的。
Use subgroup naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
sub-（下）+ group（群）= 大群之下的小群，联想“分组”里的子群。
语域：neutral 常见场景：学术或技术写作、组织/群体结构讨论、数据分类或专业报告 该词整体属于中性书面表达，本身不含强烈口语或俚语色彩；但在日常口语中并不常用，多出现在需要明确区分部分与整体的学术、技术或专业语境里。具体是否正式，要视文体和场合而定。
以 -group 结尾的单词（group、workgroup、playgroup、outgroup）与 subgroup 中的 /-ɡrup/ 读音相同，押韵。以 sub- 开头的单词（subway、submarine）整体不与 subgroup 押韵，但开头的 /sʌb/ 一致。注意 sublime /səˈblaɪm/ 等词中 sub- 读作 /səb/，是易混淆的拼写相似词。
Dictionary facts from ECDICT, WIKTIONARY.