Number of categories
分类数\\n[计] 分类数
🧩 词语组成解析
of
[əv]
prep. 关于;属于…的;由…制成;
aux. 助动词 [非标准用语、方言] =have [主用于虚拟语气];
n. 分类；类别（category的复数）
🗣️ 情景例句
And in this family.
也在这个家 。
Believe not all that you see nor half what you hear.
眼见的不能全信，耳闻的也不能半信。
It was usually very quiet, and he could see the park from his window.
那儿通常很安静，从他的窗户他可以看见公园。