The service accepts two Numbers for addition or subtraction.
该服务接受两个数字进行加减运算。
The result of adding two Numbers is the same regardless of the order of the addition.
两数相加，不管加法的次序如何，其结果相同。
In the addition of two multibit numbers, the carry of each single bit addition is added to the next-insignificance bit.
当两个多位数相加时，每一位的进位应与高一位数相加。
Create a class Calculator, which performs the addition and subtraction of two Numbers at a time. The sample code explains the expected API.
创建一个计算器类，能够在同一时间完成两个数字的加减法。不太懂，原文：%。
Atomic operations are those that can be viewed as completing in a single, logical step, such as the addition of two Numbers.
原子操作是那些可以被视为完成在一个单一的，合乎逻辑的步骤，如增加两个号码。
For addition of a char and a number, the char is coerced into a numeric value, and the two Numbers are added.
若将字符和数字相加，则会将字符强制转换为数值，而后将两个数字相加。
For addition of a char and a number, the char is coerced into a numeric value, and the two Numbers are added.
若将字符和数字相加，则会将字符强制转换为数值，而后将两个数字相加。
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