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?
If you're going to use an idiom, make sure you're using it correctly.
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?
So, this sentence is a double-edged sword.
If you can write it like this, then yeah, you're getting a bonus point.
But on the other side of it, if you write... if you make any mistakes in it, you're losing points.
So be very careful with vocabulary, extra words that you don't need, and idioms.
Now, another thing: Long, complicated sentences, they don't need to be.
Remember I said they're run-on sentences, now, another thing you have to worry about is redundancy.
This is a big word, but I'll write it here.
If something is redundant, it means it's unnecessary.
"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?
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.
If you can use three words to say something, don't use five.
If you can use five, don't use 10.
Less is more, just like when you're putting on makeup, another analogy, there, for you. Okay?
So, this is the most common mistake, let's look at a few more.
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.
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.
"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？）