| 例句 |
The children learned addition and subtraction.孩子们学了加法和减法。Addition and subtraction are inverse operations.加法和减法是逆运算。There will be simple tests in addition, subtraction, multiplication, and division.要简单测试加法、减法、乘法和除法。She can do addition, but she hasn't learned subtraction yet.她会做加法，但还没有学减法。The test involves simple calculations, such as addition and subtraction.测验包括一些简单的运算，例如加法和减法。I looked at what he'd given me and did a quick subtraction.我看着他给我的东西，快速做了个减法。 |