The world's total forest area is just over four billion hectares.

VOA: special.2010.04.06

So we can have four total hydrogens bonding here, - and we can think about how to describe these carbon- carbon bonds.

我们这里一共有四个氢原子成键，我们可以考虑怎么来-,描述碳碳键。

麻省理工公开课 - 化学原理课程节选

so the total rent is about four thousand for two bedroom. In that area, so.

所以整套的租金是每月4000美金。那片地区，

苏玛区的公寓 - SpeakingMax英语口语达人

In total,Jones played in one hundred sixty-four international games.

VOA: special.2010.06.25

So at this point in the story-- at this level in the story, if you will, I've touched one, two, three, four numbers total or I've made two comparisons.

那么这时，我总共已经动过了1，2，3，4个数字,或者说我做了两次比较。

哈佛公开课 - 计算机科学课程节选

You notice at the beginning one-two, At the beginning these chords are holding for four measures or a total of eight beats.

注意在开头，在开始的部分，和弦持续了4小节也就是8拍。

耶鲁公开课 - 聆听音乐课程节选

The total energy of the system, which we are going to get from postulate number four, which says the energy of the electron, which is the energy of the system, is the sum of the kinetic and the potential energy.

这个系统的总能量，也就是我们将从第四个假设中算出的能量，也就是电子运动产生的能量，也就是整个系统的能量，是动能和位能的总和。

麻省理工公开课 - 固态化学导论课程节选

They would have won five bucks minus five cents for a total of four ninety-five.

他将得到5美元减去5美分,就是4美元95美分

耶鲁公开课 - 博弈论课程节选

We need to fill in a total of four electrons.

我们一共需要填进四个电子。

麻省理工公开课 - 化学原理课程节选

Now we don't care what you're eating so nobody-- we're not going to attend to that at all; I mean you could eat Twinkies four times a day and that could be your total diet, or you could eat something else; it doesn't really matter so much.

我不在乎你们吃了什么,我们不关注这点,也就是说你们可以一天吃下四顿奶油夹心,作为一天的饮食,或者吃点别的,这没多大关系

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

So if we're talking about oxygen, 2s2 we would say that it's 1 s 2, then we have 2 s 2, 2p and then we have 2 p, and our total number of electrons 4 in the p orbitals are four.

所以如果我们在讨论氧，我们会说它是1s2然后我们有，然后，我们在p轨道的,电子总数是。

麻省理工公开课 - 化学原理课程节选