The ancient Egyptians used a drawing of the eye of Horus as a magic sign to protect themselves from disease,suffering and evil.

VOA: special.2009.03.22

And also that we know that the zero does not count as a node, if per se I actually had managed to hit zero in drawing that, so the correct answer would be the bottom one there.

另外你们要知道零点不是节点，假设说我确实把零点画成０了，那正确的结果就是底下这个。

麻省理工公开课 - 化学原理课程节选

Perhaps a mistake with some of the answers we got but one of our choice favorites was this one and it's actually fairly worth drawing one's attention to and that's this: I planned on taking the class as a freshman then convinced myself otherwise because I couldn't fit it into my workload.

得到的回答或许有的是错的,我们最喜欢的一个回答是这样的,值得我们注意一下：,我本打算大一就来上这节课,但却说服自己还是别去上了,因为我工作负荷满满的。

哈佛公开课 - 计算机科学课程节选

As a boy,Leonardo showed a great interest in drawing,sculpting and observing nature.

VOA: special.2010.09.15

sa So we have 1 s a, and we're drawing this as having a positive amplitude, but since we have destructive interference we're going to draw 1 s b as having the opposite sign, so we have a plus and a minus in terms of signs.

我们有，我们把这画成一个正的振幅，但因为我们是相消干涉,我们把1sb画成相反的符号，所以我们有一正一负两个符号。

麻省理工公开课 - 化学原理课程节选