add（plus）,subtract(minus),multiply(times),divide
One plus one is/equals two（一加一等于二）
Two minus one equals one./Subtract one from two equals one.(二减一等于一)
One times two equals two./Multiply one by two equals two.(一乘以二等于二)
Two divided by one equals two./Dividing two by one equals two.(二除以一等于二)
