countable 专八

countable paracompact

紧的

countable items; countable sins.

的条目；的罪恶

The word “person” is a countable noun.

person这词是名词。

By the method of "Every open set in R" is the union of an at most countable collection of disjoint connected open sets", the paper deals with some problems of countability in real analysis.

摘要以“平面上交的若干开集所成之族至多”为基点，对一些关结果给出了全新的直观化证明。