It does not have a mechanical keyboard and weighs less than one kilogram.

VOA: standard.2010.04.03

I'm going to give you a glass case and in the glass case is an entity with this as one kilogram, by definition.

我给你一个玻璃箱,箱子里放的东西刚好是 1 千克,这是根据定义的

耶鲁公开课 - 基础物理课程节选

If I pull the one kilogram mass and I let it go, it does something, some acceleration.

如果我拉 1 千克重的物体并松手,就会获得一个加速度

耶鲁公开课 - 基础物理课程节选

So it died in space. A few months later, the Soviet Union put a one thousand three hundred sixty kilogram satellite into space.

VOA: special.2009.06.10

A kilocalorie, and this is really what we--when people talk about calories, how many calories in food, it's really kilocalories that they're referring to, but that would be the energy required to raise a kilogram of water one degree centigrade.

一千卡,是人们讨论卡路时是真正用的单位,当提起食物中的热量,人们指的是多少千卡,一千卡,是将一千克水提升1℃所需要的热量

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

A BTU is the amount of heat energy needed to raise the temperature of about one-half kilogram of a substance by one degree Fahrenheit.

VOA: special.2010.11.23

Now, I tie this one kilogram mass to it and let it go.

现在,我把这个 1 千克重的物体系上,并松开手

耶鲁公开课 - 基础物理课程节选

You hook one end of the spring to a wall and you pull it from rest by some amount and you attach the one kilogram mass to it.

你把弹簧的一端固定在墙上,然后拉伸一段距离,接着你把 1 千克物体固定在上面

耶鲁公开课 - 基础物理课程节选

The point is, the one kilogram is a matter of convention.

关键在于,1 千克已经定下来了

耶鲁公开课 - 基础物理课程节选

But this is the acceleration of the one kilogram mass.

但这是 1 千克物体具有的加速度

耶鲁公开课 - 基础物理课程节选

So, when I divide these two numbers, I'm going to find a1 over aE is equal to mE over m, which is the one kilogram mass.

把这两个式子相除,就会发现 a1 比 aE 等于 mE 比 m,m 等于 1 千克

耶鲁公开课 - 基础物理课程节选

We can be precise about how much bigger by saying, "If the acceleration of a body to a given force is ten times that of a one kilogram mass, then this mass is one-tenth of one kilogram."

我们能精确地知道质量能大多少,只需要说,"如果物体在给定力作用下的加速度,是一个 1 千克物体的加速度的 10 倍,那这个物体的质量就是 1 千克的十分之一"

耶鲁公开课 - 基础物理课程节选

If you knew this was one kilogram, then the acceleration of the elephant, which will be some tiny number, maybe 100th of what this guy did; the mass of the elephant is then 100 kilograms.

如果已知这个物体的质量为 1 千克,那大象的加速度,会是一个比较小的数,可能是物体加速度的 1 / 100,大象的质量就是 100 千克

耶鲁公开课 - 基础物理课程节选