1
be a real number
The solution must be a real number.
解必须是一个实数。
实数
real numbers — plural of real number
先理解核心含义，再看它在真实句子里的用法。
实数
A number that can be expressed as a decimal, including both rational numbers like 2, -5, or 2/7 and irrational numbers like the square root of two.
The solution must be a real number.
解必须是一个实数。
收敛有理数序列的极限
The limit of a convergent sequence of rational numbers, whether the limit is a rational number such as 2, -5, or 2/7 or whether the limit is an irrational number such as the square root of two or the circumference of the circle whose radius is one.
浮点数
A floating-point number.
Every real number corresponds to a unique point on the number line.
每个实数都对应数轴上的一个唯一位置。
The quadratic equation has two real number solutions.
这个二次方程有两个实数解。
Floating-point numbers in computers approximate real numbers.
计算机中的浮点数近似于实数。
The solution must be a real number.
解必须是一个实数。
The set of real numbers is uncountable.
实数集是不可数的。
For any real number x, x² is nonnegative.
对任意实数x，x²是非负的。
Not this
He studies real number.
Use this
He studies real numbers.
英语中，表示某一类事物或学科时，通常使用复数形式。中文的“实数”没有复数变化，学习者常将“real number”当作不可数名词使用，但实际可数，因此需要改为复数“real numbers”。
Not this
There are two real number.
Use this
There are two real numbers.
当数量明确为二时，需要将“real number”变为复数“real numbers”。中文名词无单复数变化，学习者易忽略英语的可数名词复数规则。
Choose the next layer that will help you use real numbers with more confidence.
Recommended next
Missing: Collocations
Complete this area with collocations.
Includes Context & register & Memory tip
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Includes Synonyms & Antonyms
Expand your vocabulary with synonyms and antonyms.
Includes Word components & Thematic vocabulary
Learn how to build related words using roots, prefixes, and thematic clusters.
Includes Idioms & Cultural references
Discover idioms, slang, and famous pop culture quotes.
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
Use real numbers naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
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.