a heptad of + noun
heptad 表示七个事物组成的一组，常用于科学或技术语境。
A heptad of amino acids forms the active site.
七个氨基酸组成一个活性位点。
七个一组；七件一组
七碱基序列；七个一组的事物,septet 的同义词。；七个碱基的序列。；七个；成七的一组
A group of seven things.
七个一组的事物,septet 的同义词。
Synonym of septet: a group of seven things.
七个碱基的序列。
A sequence of seven bases.
The heptad of students involved in the project each had a specific role.
参与这个项目的七人小组每人都有特定的任务。
用法提示：名词heptad在此表示由七个成员组成的集体。
In some ancient calendars, a heptad of days formed a sacred week.
在一些古老历法中，七天构成一个神圣的周期。
用法提示：名词heptad表示数字七或七个一组，此处指七天。
The chemist discovered a stable compound with a heptad of nitrogen atoms.
这位化学家发现了一种含有七个氮原子的稳定化合物。
用法提示：名词heptad在这里指七个原子组成的基团。
heptad 表示七个事物组成的一组，常用于科学或技术语境。
A heptad of amino acids forms the active site.
七个氨基酸组成一个活性位点。
in heptads 表示以七个为一组的方式。
The molecules are arranged in heptads.
这些分子以七元组的形式排列。
grammar · medium
易错句子Heptad apples are on the table.
正确表达A heptad of apples is on the table.
Heptad是名词，表示‘七个一组’，不能直接修饰名词；应使用‘a heptad of’结构或直接用数字‘seven’。
grammar · medium
易错句子A heptad has seven sides.
正确表达A heptagon has seven sides.
Heptad意为‘七的集合’，而‘heptagon’是七边形；混淆了形状与数量概念。
heptad指七个或七个为一组，heptagon指有七条边的几何图形，使用时不混淆概念
septet常用于音乐或人数较少的群体，heptad更偏向学术或化学术语，不宜互换
heptane是化学物质庚烷，heptad指数字七或七价原子，两者含义不同
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