They propose that each so-called fundamental particle actually contains a tiny, vibrating, one-dimensional loop of string.

他们认为每一个所谓的基础粒子实际有一个更小的，振动着的，一维循环的弦。

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You then move the actual sending of the mail outside this loop, instead building a string of text to add to the body of the message.

随后我们将邮件的实际发送移动到循环体外面，而在循环体中构建一个要添加到消息体的文本字符串。

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Other theories of quantum gravity, including string theory and loop quantum gravity, are far more difficult for newcomers to embrace.

量子引力的其它理论，包括弦论和圈量子引力，对新人来说都更难以涉足其中。

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Well, this question mark becomes an O, this question mark becomes an O, and then the loop terminates 0 1 2 because it's iterating from zero to N so that's zero, 1, 2 and the length of the string is 3 so the loop terminates, but I remember that I needed to have this special sentinel value so I'm just going to put it there manually.

嗯，这个问号变成了，这个问号变成了0，然后循环结束了,以为迭代从0到N，那就是，字符串的长度是3，然后循环就结束了，但是我记得我需要这个特殊的标记值,所以需要手动的加上它。

哈佛公开课 - 计算机科学课程节选

Further north, a string of villages huddles along cliffs reached by a quiet loop off the main highway to the Romanian border.

BBC: The Black Sea by Moskvitch