你有没有过想要沉下心来，开始认真地做一件事呢？可能你想开始抛开一切，每天认真地听一听英语；或者全心投入去读完一本书；再或者全力以赴地学一项技能……我们听一听Joy and Chris是怎样用英语表达的吧！ C: Hi guys. I’m Chris. J: And I’m Joy. The idiom we are covering today is: buckle down. It means to put in a lot of effort toward something and begin to work very seriously at this thing. You can use it like this: I’m buckling down. / She has buckled down. / They are gonna have to buckle down. C: Well, buckling down can be used to express fastening a seat belt. So we can imagine that if you have fastened your seat belt, you are ready to start a journey. And you are taking it very seriously. For students who are in the last year of high school, an important college entrance exam is coming soon. So you really have to buckle down and study hard right now. Or there is a big project for you to complete this month and all of your leaders are very concerned about it. If you don’t buckl...