You can divide by 2, 3, or 9.
除以2、除以3、除以9都行。
But dividing by zero is not allowed.
可除以零，数学里不允许哦。
Dividing means sharing things fairly.
除法呀，就是把东西平均分。
Sharing by zero means giving to nobody.
除以零，等于分给一个都没有。
That leaves us with no answer at all.
这样一来，根本没法回答。
Math teachers draw a hard line here.
老师在这儿划了条硬线。
Never, ever divide a number by zero.
千万千万别拿数去除以零。
