聊天常用英语口语第46期:好久不见了啊...

Diploma: a document showing that you have completed a course of study or part of your education 毕业文凭
a High School diploma
高中毕业文凭

Definitely: a way of emphasizing that sth is true and that there is no doubt about it 肯定；没问题；当然；确实 
I definitely remember sending the letter.
我记得这封信肯定发出去了。
‘Was it what you expected?’ ‘Yes, definitely.’
 “那是你所期待的吗？”“当然是。”
‘Do you plan to have children?’ ‘Definitely not!’
 “你们打算要孩子吗？”“没这个打算！”
Some old people want help; others most definitely do not.
有些老人需要帮助，有些老人却根本不需要。

Senior: high in rank or status; higher in rank or status than others 级别（或地位）高的
a senior officer/manager/lecturer
高级军官╱经理╱讲师
a senior partner in a law firm
律师事务所的主要合伙人
a senior post/position
高级职务／职位
I have ten years' experience at senior management level.
我有十年的高层管理经验。
Junior nurses usually work alongside more senior nurses.
初级护士通常和较高级的护士一起工作。
He is senior to me.
他的职位比我高。
The meeting should be chaired by the most senior person present.
会议应由在座的职位最高的人主持