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Use unsigned types only when you need modulo arithmetic or very very large numbers. 仅在你需要模算术或需要很大很大的数字时，才使用无符号类型。
The little boy was not good at arithmetic. 这个小男孩算术不太好。
She grounded her pupils well in arithmetic. 她给自己的学生打下良好的算术基础。
modulo arithmetic 模运算
He got the answer by mental arithmetic. 他用心算得出了答案。
He is good at mental arithmetic. 他擅长心算。
I'm good at history but not so hot at arithmetic. 我的历史成绩不错，但算术不太好。
He brushed up on fractions before taking the arithmetic test. 在参加算术考试前他又重温了分数。
Per favore, mi dia un modulo per telegramma! 请给我一张电报单！
What's the correct answer to this arithmetic question? 这道算术问题的正确答案是什么?
My brother is poor at arithmetic. 我弟弟的算术很差。
Her school report shows that she is weak at/in arithmetic and biology. 从她的学习成绩单可看出她算术和生物成绩差。
Some hard problems in arithmetic bewilder me. 算术上一些难题使我糊涂。
We do addition and subtraction in arithmetic. 在算术里，我们作加减运算。
The boy used to be no good at arithmetic. 过去那男孩算术总是不行。
To solve by means of arithmetic. 计算用算术方法解决
The teacher grounded his pupils in arithmetic. 老师对他的学生进行算术基础训练。
I saw him puzzle over an arithmetic problem. 我看见他正在苦心思索一道算术题。
Modulo crypting / decrypting program by me and my classmate. (译)：模crypting /解密程序由我和我的classmate.
He is studying some arithmetic problems. 他正在研究一些算术问题。