Followed by a long history of inferior schools and segregation, and also expectation, continued disparity in terms of school and education, which comes to another question.

经过了长时间的,低等教育和种族隔离，以及学校及教育上,长期的歧视和不平等，这就牵扯到了另一个问题。

麻省理工公开课 - 媒体、教育、市场课程节选

Here is the pitch in--of--a string an octave higher so you can see it this way. As you probably know, if you take a long string and pluck it, it's going to take that long string a long time to pass that sort of cycle, if you will, just one pass through that cycle.

这也是个音高,一个高八度的音弦,你可以这样这样看 你们可能知道,如果你拨动长弦,长弦要经过很长时间,才能完成一个震动周期,如果你想,可以尝试下

耶鲁公开课 - 聆听音乐课程节选