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Now, for some reason people love this idiom: "a double-edged sword", "Everything is a double-edged sword."
由于某种原因，人们很爱"a double-edged sword"（双刃剑）这个习语，"Everything is a double-edged sword."（每件事都是一把双刃剑）。
The problem with a double-edged sword is that there's two sides to it, and most people don't realize that. Right?
“双刃剑”的问题在于它有两面，但大部分人没有意识到这一点，对吗？
If you're going to use an idiom, make sure you're using it correctly.
如果你们要用习语，请确保你们使用正确。
So, this idiom, "a double-edged sword" means that something, or a situation, or an action has both a positive side and a negative side.
那么，这个习语， "a double-edged sword"的意思是，某个事情或者一个状况，或一种行为既有积极的一面也有消极的一面。
So if you're going to use this idiom, you better explain to the reader: what is the positive, what is the negative? Okay?
所以如果你们要用这个习语，最好给读者解释一下什么是积极的，什么是消极的。
So, this sentence is a double-edged sword.
然后说这个句子是一把双刃剑。
If you can write it like this, then yeah, you're getting a bonus point.
如果你们能这么写，那么，没错，你们会得到额外的分数。
But on the other side of it, if you write... if you make any mistakes in it, you're losing points.
但是，另一方面，如果你们写......你们在其中犯了任何错误，都会丢分。
So be very careful with vocabulary, extra words that you don't need, and idioms.
所以在词汇、你们不需要的额外单词和习语方面要多加小心。
Now, another thing: Long, complicated sentences, they don't need to be.
现在我们来讲另一个问题：长句、复杂句，它们不用这样的。
Remember I said they're run-on sentences, now, another thing you have to worry about is redundancy.
记得我说过它们是流水句吗？你们要担心的另一件事是"redundancy"（冗余）。
This is a big word, but I'll write it here.
这是个大词，不过我会把它写在这儿的。
If something is redundant, it means it's unnecessary.
如果某个东西是冗余的，那就说明它是不必要的。
"The CEO's tenure at the company", now, here you noticed I put "at the company".
就拿"The CEO's tenure at the company"来说吧，你们注意到我在这里写了"at the company"。
Here... here, I didn't put "the company", why?
这里......这里我没有写"the company"，为什么？
A CEO is a head of a company, it's understood that the time at the company, I don't actually need to say it.
CEO是一家公司的领导，所以就能理解为在公司的时间，我不用真的把它说出来。
If you can use three words to say something, don't use five.
如果能用三个单词把某件事说出来，就不要用五个。
If you can use five, don't use 10.
如果能用五个，就不要用十个。
Less is more, just like when you're putting on makeup, another analogy, there, for you. Okay?
少即是多，就像化妆一样，这是给你们的另一个比方，听懂了吗？
So, this is the most common mistake, let's look at a few more.
所以，这是最常见的错误，我们再来看几个。
Okay, so now we're a little bit busy, here, but I'll squeeze everything into one shot so it's much easier for you.
现在我们这里有点拥挤，不过我会把所有内容都挤进一块儿，这样对你们来说就简单的多了。
What I'm going to do, I'm going to begin by looking at a very classic task, either IELTS or TOEFL will give it to you.
我要做的是，我要从看一个很经典的试题开始，这个题你们要么会在雅思考试碰见，要么会在托福看到。
"Parents make the best teachers. Do you agree or disagree? "
"Parents make the best teachers. Do you agree or disagree? "（家长是最好的老师，你同意吗？）
