单词uncountable-noun
n.: 不可数名词
网络: 是不可数名词；不可數名词；则是不可数名词
As a noun, "travel" refers to the activity in general and is generally used as an uncountable noun.
travel做名词的时候指的是旅行这种行为本身，通常用作不可数名词。
The uncountable noun plural special there are many forms of expression.
而不可数名词复数的特殊形式也有很多种表达方式。
Question 80: What is an uncountable noun?
什么是不可数名词？