The strings are now metallic but sixteenth, seventeenth to eighteenth century they would have been made out of cat or sheep gut.

弦现在是金属的,但在十六,十七,到十八世纪,弦是用猫肠或羊肠线制作的

耶鲁公开课 - 聆听音乐课程节选

So on the left hand side of this particular languages environment I have some puzzle pieces and they are shaped and colored ; in a manner that hints out their functionality; any blocks that tell the Cat as we'll see in a moment, what to do something happen to be orange.

在这个程序语言界面的左手边有一些拼图,他们的形状和颜色代表他们的功能,我们马上就能看到;,任何一个给计算机发出指令的图块，都是橙色的。

哈佛公开课 - 计算机科学课程节选