内行的

例句：

1. 1. He is a very experienced engineer, so he knows what he's doing.
   他是一位非常有经验的工程师，所以他知道自己在做什么。
2. 2. She is an expert in her field, and she can solve any problem that comes up.
   她在她领域里是专家，她能解决任何出现的问题。
3. 3. The new software is very user-friendly, so even the most novice users can use it.
   这款新软件非常用户友好，所以即使是最不熟练的用户也能使用它。