日志也记录了杂乱无章的太空中发生的一些虚惊事件:弃用的火箭级、覆盖层以及脚固定环都曾擦身而过。
The logs also included near-misses in the clutter of space: old rocket-stages, blankets and foot restraints, all orbiting past.
在第一章中我们给出了本文所需用的一些基本定义,以及给出了有关投射模、IF环和半单环等的一些重要已知结论。
In chapter one, we provide some basic known definitions and important conclusions of projective modules, IF rings and semi-simple rings, and so on, which are needed in the paper.
在第二章,研究了随机环镜中的马氏链的弱常返性,给出了弱常返性的一个充分条件。
In the second chapter, we study weakly recurrence of the Markov in random environment, and provide the sufficient condition for weakly recurrence.
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