In chapter 5, demodulation models of many modulation systems are established. Square loop model is established to detect carrier.

第五章中给出了对各种调制方式的解调模型，成功建立了平方环载波恢复模型。

youdao

Looking from a distance like a gigantic arch, it is a continuous loop, a kind of square doughnut.

从远处看像一座巨大的拱门，它是一个连续的环，像一种方形面包圈。

youdao

(youtube.com/user/dabblerDOTca) has instructional videos on how to tie a tie, fold a pocket square, sniff out a good wine and perfect a loop choke self-defence manoeuvre.

ca（youtube.com.user/dabblerDOTca）上有指导类视频，讲授如何打领带，叠口袋方巾，嗅出上等葡萄酒和演习提高自卫能力。

youdao

And if I were to use that again, I'd just put it on your handout, I could go back and rewrite that thing that I had previously for finding the square roots of the perfect squares, just using the FOR loop. OK. What I want to do, though, is go on to-- or, sorry, go back to - my divisor example.

它可以是任意的集合,如果我又要去用这个方法的话,我会把它放在你们的课堂手册上的,我可以回过头去用FOR循环，重新写我们那个求平方数的程序，我想要做的是，是继续-哦抱歉,回到-我的除数那个例子。

麻省理工公开课 - 计算机科学及编程导论课程节选