For example, if you're talking about the chalk--if I throw the chalk, you will have to know where it is and how fast it's moving.

比如说,这支粉笔,如果我扔出这支粉笔,你就像知道它的位置和速度

耶鲁公开课 - 基础物理课程节选

You can also get away, as I said last time, with just putting parentheses in JavaScript and PHP, this is, in fact, the norm.

就像我上次说的，你也可以不用参数，在JavaScript和PHP中只用圆括号，这实际上是一个规范。

哈佛公开课 - 计算机科学课程节选

Yeah, if you immediately said, "Well, if the vector is , then the vector looks like this.", you're making the assumption that I am writing the vector in terms of i and j.

对,如果你紧接着就说," 如果一个矢量是,那么它就像这样 ",你其实就是假设了,我是按 i 和 j 分量的形式写的这个矢量

耶鲁公开课 - 基础物理课程节选