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1·If you had one negative number in it, then the product would be a negative number and, if you took a root of that, then you might get an imaginary number.

如果这当中有一个负数，乘积就会变成负的，如果你对一个负数开根号，你就会得到一个虚数。

2·In fact, it can generally be a complex number with both a real part that's an ordinary number and an imaginary part that's multiplied by the square root of one.

事实上，它通常是一个复数的形式，包括普通数字的实数部分和需要乘以负一的平方根的虚部。

3·WHEN Charlotte Hobbs decided to teach her 11-year-old pupil about the imaginary maths needed to work out the square root of a negative number, she knew it would be a stretch.

当夏洛特·霍布斯决定教她11岁的学生用来计算负数平方根的虚数时，她知道这是一个艰巨的任务。