DWDI

例句：

1. 1.I am not good at math, so don't worry about the test.
   我数学不好，所以考试不用太担心。
2. 2.The project is challenging, but don't worry, we will find a solution.
   这个项目很有挑战性，但不用担心，我们会找到解决办法的。
3. 3. Don't worry, I have prepared for this exam all semester.
   别担心，我已经整个学期都准备这个考试了。