奇怪的是，虽然恐惧是一种单一原始的情绪，我们却有那么多形容它的字眼。
It is strange that we have so many words for fear, when fear is such a unitary, primal feeling.
不严格地说，上面的交通堵塞情景也可用“多米诺效应”来形容。但是，“多米诺效应”依赖于单一的一系列等同事件。
Our scenario could also be loosely described in terms of a "domino effect", but the "domino effect" relies on a linear series of identical events.
本文利用奇异摄动理论的两时间变量展开法，研究了垂直强迫圆柱形容器中的单一水表面驻波模式。
The single standing wave mode in a circular cylinder subjected to a vertical oscillation was studied by employing two-time-scale perturbation expansions.
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