Could I change this to "half"? Yes.
我能不能把这个比例词换成"half"？可以啊。
Could I write "fifty percent", not using numbers, but with letters?
可不可以写成"fifty percent"，不用数字，而是写成字母形式？
Yes, I could spell out "fifty percent", it's all the same; it means the same thing.
可以啊，可以拼写成"fifty percent"，都是一样的，意思都一样。
There is, however, one thing you should be aware of.
但是，有一件事你们应该意识到。
In English, we do not like to start sentences with numbers.
在英语中，我们不喜欢用阿拉伯数字作为句子的开头。
So, for example: "50% of the living expenses is rent.", this is...this is not good, we don't like to start out with a number.
比如："50% of the living expenses is rent."（50%的生活费花在了房租上），这......这不好，我们不喜欢用阿拉伯数字开头。
It would be better to actually write it out. Okay? Just like that, okay, excellent.
切切实实用字母把它拼写出来更好，知道了吗？就像那样，很好。
So, again, these are great sentences to use when you're writing about pie charts.
再说一遍，这些是在描述饼状图的时候可以使用的绝佳句式。
So, now let's look at some ways to talk about numbers.
现在我们来看看描写数字的一些方法。
We've already talked about 50%, we've talked about how it can be called half, and how...the different spellings of 50%.
我们已经讲过了50%，我们已经讲过了它可以写成"half"，讲过了50%的不同英文拼写。
So, now, let's look at some other different ways to talk about percents.
那么现在我们来看看描写比例的一些其他方式。
I have down here the word "a third",
我在下面这里写了"a third"（三分之一），
so, if this is my pie chart, a third, there are three pieces, would be about this, which is around 30 to 35 percent is a third. Okay?
所以，如果这是我的饼状图，这里有三块，那么"a third"就是30%到35%左右。
I can also talk about "a quarter", which would be about 25%.
我还可以说"a quarter"（四分之一），那大概是25%。
Okay? If we looked up here, food is about a quarter.
懂了吗？看这里，食物所占比例大约是"a quarter"。
We can also talk about "two thirds", this is where it gets a little bit confusing.
我们还可以说"two thirds"（三分之二），这个地方开始有点令人困惑了。
So, a third is, like I said, we have one out of three, here we have two out of three, which is about 66%, so, two thirds would look like...one third, two thirds.
"a third"，就像我说过的，是三份中的一份，这里我们有三份中的两份，也就是66%左右，所以"two thirds"看上去就是......这是"one third", 这是"two thirds"。
Okay? So, this is one third and this is two thirds.
所以这是"one third"，而这是"two thirds"。