步骤是任务的序列，可以由同一角色不间断地执行。
A step is a sequence of tasks that can be performed without interruption by the same role.
相反，它们的角色是由在强脉冲周围不间断冒出然后逐渐消失的光量子来扮演的。
Instead, their role was played by evanescent photons continually popping into existence around the strong pulse.
中国是世界上有着最长的不间断的文明史，北京则在其中扮演着很重要的角色。
China lays claim to one the longest continuous civilizations in the world with Beijing playing an important historical role.
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