Cách sử dụng
The expression "be no joke" means that something is a serious matter and shouldn't be treated lightly. It is usually used when talking about difficult situations, problems or challenges. For example, if someone says "Learning English can be no joke", it means that learning English is a serious and difficult task and shouldn't be taken lightly. Similarly, if someone says "Working in a hospital is no joke", it means that working in a hospital is a serious and challenging job.