线性方程中的所有项均为一次项。

All of the terms in a linear equation are of the first degree.

youdao

生活给我们带来了一段又一段的经历，我们的每一次行动、每一个决定、每一项选择都在决定着我们将走向何方。

Life presents us with experience after experience, and with every deed, decision, and selection, we are determining where we will end up.

youdao

一项调查发现，成年人每天查看智能手机85次，即每10分钟查看一次。

A survey found that adults checked their smartphones 85 times a day, or once every 10 minutes.

youdao

If you're taking two derivatives you can add a constant and something linear in t.

如果你要二次求导,你可以添加一个一次项和常数项

耶鲁公开课 - 基础物理课程节选

If you're taking only one derivative you can add a constant.

如果只进行一次求导,你可以添加一个常数项

耶鲁公开课 - 基础物理课程节选

You can add something else to the answer without invalidating it, and that is anything with one power of t in it, because if you take one derivative it'll survive, but if you take two derivatives, it'll get wiped out.

你可以往答案后面加上其它东西,而且不影响结果,也就是任何t的一次项,因为你求一次导数之后它还在,但如果你求两次导数,这一项就不存在了

耶鲁公开课 - 基础物理课程节选