The finite temperature field theory have two formalisms imaginary time and real time formalisms.

有限温度场论包括虚时和实时两种理论形式。

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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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In the majority of applications either the force field or the displacement field is imaginary.

在多数的应用中，不是力场就是位移场总有一个是虚设的。

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It's an odd predicament, to say the least, but if you're familiar with the kind of off-field trouble that professional athletes can get into, an imaginary girlfriend doesn't sound like much of a headache for human resources.

WSJ: NFL Combine: Football Is Back! (Wait: Already?)��Jason Gay