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。
An expression that is the sum of a real number and a vector and that contains four terms, one real and three imaginary.
四元数一实数和一矢量的和的表达式，有四个项，一个为实数项，另外三个为虚数项。
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。
The universal gravitation field is described by imaginary number in the paper. It's energy density is negative real number. And it accord with conservation of energy.
采用虚数场描述万有引力场，其场能密度是负实数，满足能量守恒定律。
The universal gravitation field is described by imaginary number in the paper. It's energy density is negative real number. And it accord with conservation of energy.
采用虚数场描述万有引力场，其场能密度是负实数，满足能量守恒定律。
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