他突然觉得恶心，猛烈地干呕起来。Nausea surged in him and he retched violently.我感到恶心,干呕了几次, 但没吐出什么来.I felt some nausea and retched several times. But I didn't throw up anything.你最近总是干呕、困倦,是不是 有身子 了?You always have a dry cough and lo...
If you've got bags you're better off taking a taxi.你要是大包小包的，不如打的算了。They are much better off than us.他们比我们富得多。He found himself no better off than any of his compeers.他发觉自己比其他所有的同伴都好不了多少....
In other words, The Hermiticity of a matrix is invariant under unitary transformations.换言之, 矩阵的厄密性在幺正变换下保持不变.A matrix of this sort occurs, for example, in electric networks when mutual inductance is present.例如, 当电网络中有互感时...