1
be a rational number
π is not a rational number.
π不是有理数。
有理数
先理解核心含义，再看它在真实句子里的用法。
有理数
A number that can be expressed as the quotient of two integers, where the denominator is not zero.
π is not a rational number.
π不是有理数。
可以表示为两个整数之比的数。
A number that can be expressed as the ratio of two integers.
Every rational number can be written as a fraction of two integers.
每个有理数都可以写成两个整数的分数。
The students compared rational numbers and irrational numbers in today's math class.
学生们在今天的数学课上比较了有理数和无理数。
A rational number has a decimal expansion that either ends or repeats.
有理数的小数展开要么终止，要么循环。
π is not a rational number.
π不是有理数。
Can this fraction be expressed as a rational number?
这个分数能表示为有理数吗？
Find the rational number between 0 and 1.
找出0和1之间的有理数。
The set of rational numbers is dense.
有理数集是稠密的。
Not this
Rational number can be expressed as a fraction.
Use this
Rational numbers can be expressed as a fraction.
错误使用单数形式表示一类数。有理数是可数名词，当泛指这类数时，应使用复数形式"rational numbers"。
Not this
This is rational number.
Use this
This is a rational number.
缺少不定冠词"a"。当表示一个有理数时，需要冠词"a"。
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Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
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Revisit a common error or keep this word in your review list.
可数名词
页面下方列出了常见词形变化。学习时注意它们在句子中的语法位置。
Dictionary facts from ECDICT, WIKTIONARY.