另外一位门牙只有一颗。

Another has a single front tooth.

youdao

一位门童帮我们下车，我觉得自己仿佛踏入了19世纪。

A doorman helps us from the coach, and I feel like I've stepped into the 19th century.

youdao

锁从里面发出嘎吱嘎吱的声音，一位老人打开了门。

The lock creaked now from inside, and an old man opened the door.

youdao

But then an old Yalie who took this course when he was very young, and later became an ancient Greek historian, took the wonderfully outlandish device of answering this question.

有一位老耶鲁人在年轻时选了这门课,后来成了一名历史学家,专攻古希腊史,他极其出色地回答了这个问题

耶鲁公开课 - 古希腊历史简介课程节选

For example, let's pretend that you are speaking with a friend who had been studying for a test for some time.

例如，我们假设你跟一位朋友在聊天，他已经为一门考试复习了好一段时间。

I'm sure 课堂 - SpeakingMax英语口语达人