例句-1:The first thing I think we'll do is travel around the world. I know my wife has always wanted to go to Paris, so I think we'll go there first. We will have to bone up on our French! All I know is Bonjour Madame and Merci!
例句-2:I'm so happy that I was accepted into the MBA course, but I'm a little worried about the mathematics requirement. We actually have to know some university level economics. I'm going to have to bone up on calculus.