设X为拓扑空间，若X有一个可数基，则称X为第二可数的。若对任意x∈X，邻域系N(x)有一个可数基，则称X为第一可数的。
两班学生分别进行名词可数性多选题的一次前测和两次后测。
The two classes were given a pre-test and two post-tests in the form of multiple-choice questions on count and mass nouns.
可数性除了指被计数的可能性外，还可以指可数语义或用法，以及可数名词。
Apart from the possibility of being counted, countability also refers to countable meanings or usages as well as count nouns.
就名词的数范畴而言，可数性是可数名词的本质属性，单、双、复数形态是可数性的一种外在实现。
For the Number of nouns, countability is the essential property of count nouns, but the singular, dual and plural are the realization of this property.
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