即使IList接口不是协变的，一个只读列表接口也理应如此。
And while IList isn't covariant, a read-only list interface would be.
经典电磁理论是四维协变的，相对论时空概念的改变是根本性的改变。
The change of time and space concept of theory of relativity is right-about.
通过严格求解广义协变的电子运动方程，讨论了强激光等离子体中自由电子的经典行为。
The classical behavior of a free electron in a strong laser plasma is discussed by solving the generally-covariant equation of motion for an electron.
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