The counterterrorism operation in Chechnya was instituted in 1999, when Russia sent troops for the second time since the collapse of the Soviet Union to put down a local separatist movement.

VOA: standard.2009.04.16

OK, and you can see that this thing ought to unwrap, it's going to keep extending out those multiplications until gets down to the base case, going to collapse them all together.

好，你可以看到这种方法,是怎么解决的,他一层层的将乘法展开一直到最底层,然后将他们一起乘起来。

麻省理工公开课 - 计算机科学及编程导论课程节选

Contrast his images of joyous or demonic assent with the images of catastrophe, of descent, of collapse in Eliot, "London Bridge is falling down."

对比他关于喜悦或着迷的描写,这些都是和灾难，对衰退的描写，或者艾略特描写的崩塌“伦敦桥在倒塌“，相一致的“

耶鲁公开课 - 现代诗歌课程节选