By analysing frequency spectrum in this paper, we can understand that when NRZ code be transferred into RZ code of 1/2 mark-to-space ratio, the timing clock can be obtained at largest power.

本文通过对NRZ、RZ伪随机码序列进行频谱分析，得知当NRZ码变换成码元占空比为1/2的RZ码时，所提取出的定时时钟功率最强。

youdao

They became the first company in their field to pass the $2 billion turn-over mark.

他们成为他们那个领域第一家市场营业额超过$20亿的公司。

《柯林斯英汉双解大词典》

You should decide on the best choice and mark the corresponding letter on Answer Sheet 2 with a single line through the centre.

选择最恰当的答案，并在答题卡2相应字母中心处画一条线。

youdao

In fact, he broke the 4 minutes and 10 seconds mark, 4 minutes and 5 seconds mark and he got 4 minutes and 2 seconds and stopped, like everyone else-- could not go below the 4 minutes and 2 seconds.

他突破了四分十秒，四分五秒,跑到四分两秒时停止，像所有人一样-,无法低于四分二秒。

哈佛公开课 - 幸福课课程节选

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