common issues

• 常见问题

common issues的用法和样例：

例句

1. This section explains many common problems in mail flow.
   此部分说明了邮件流中的许多常见问题。
2. With the common problems in projects, presents the optimal design of circulating pumps.
   结合工程常见问题，提出了循环水泵的最优化设计。