That definition of 'moonshot' makes more sense. Now I understand why people have been talking about a moonshot vaccine. Feifei Exactly! An experimental vaccine to fight Covid-19! You are really ...

Remember, you can only use this expression to describe the person or people who are experiencing success. Feifei Oh yes, that’s right. 记住，我们只可以说一个人或一组人 “on fire”，不能说一件事情 “on fire”。 So we can say a ...