To tie, "tie," something is to create -usually to create a little knot, "knot,"  系东西是进行手工创造——通常情况下是打个“结”，

which is when you take a piece of rope or string and you move it in such a way  你可以拿一个绳或者线，来回穿梭，

that it creates almost like a little lock, and we call that a knot. 做成类似于小锁的东西，我们称之为结。

For example, when you are tying your shoes, you take the little strings in your shoes, such as tennis shoes 举个例子，你在系鞋带时，把一些小绳穿在你的鞋里，如网球鞋，

we called those strings shoelaces - and you tie knots in them so that they're tight.   那些绳子我们叫作鞋带——你在鞋带上打个绳结，这样他们就紧了。

So, you tie a knot to keep a rope tight to keep it from becoming loose. 所以，打结就是让绳子紧一些以防松动。

In the story, Lucy says that she ties her hair back, which means she takes her hair,  这个故事中，露西说她把头发系在后面，这意味着她要把她的头发拿起来，

and because she has long hair, she takes her hair and she puts it toward the back of her head,  因为她的头发长，所以她把头发放到脑后，

and then she puts something around it to keep it there so it doesn't go back onto her face. This is tying it back.   然后用东西系起来，这样，头发就会留在那，不会沾到脸上。这就是把它系在后面。

Lucy says that she doesn't "like getting hair in" her "face," and that is why she ties her hair back.   露西说她不喜欢把头发粘在脸上，所以把头发系在后面。

Then she flosses and brushes her teeth, and is now "ready for bed.   然后她用牙线刷牙，准备好睡觉了。

By this time," she says," I am pretty beat," "beat." When you say you are pretty beat, you mean you are very tired.    这时，她说，“我非常累” 当你说你很疲惫，意思是你很累。

Lucy goes into her bedroom and she gets undressed. To undress is the opposite of to dress.      露西进入卧室，脱掉衣服。脱衣和穿衣相反。

To dress means to put clothes on you, so to undress means to take your clothes off.   一个是指穿上衣服，另一个则是把它们脱掉。

To get undressed means to undress yourself - to take your clothes off. 因此，脱衣就是自己脱掉衣服——把衣服脱下来。