aleph-null

中文含义：aleph-null是一个数学符号，表示可数无穷大的集合，即可由自然数一一对应到该集合中的元素。

英语词性：noun

美式发音：ˈæləf nʌl

同义词：countable infinity

易混淆单词：uncountable infinity

双语例句：

1. We can see that the set of natural numbers has the same cardinality as the set of even numbers, which is aleph-null.
2. It is proved that there are infinities greater than aleph-null, such as aleph-one.