驱替过程是个传质、传热过程，包括多种随时间和空间变化的界面现象。
And the displacement process is a process of fluid mass and heat transfer, which refers to many interface phenomena changed with time and space.
交通流理论是研究在一定环境下交通流随时间和空间变化规律的模型和方法体系。
The traffic flow theory is a set of models and method frames which aims is to study evolvement laws of traffic flow in time and space dimensions under some conditions.
我们有一个理论，M理论或弦理论，认为自然界的常数，是钉在“场”里的，它们随时间和空间而变化。
And we have one theory, m theory or string theory, suggests that the constants of nature are pegged to fields that can vary across space in time.
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