It used to be that players in professional sports could change teams only if they were traded, sold or released.

VOA: special.2010.07.26

But this antigen presenting cell is more likely a professional antigen presenting cell, or a subset of cells of your immune system that are specialized in ingesting foreign particles and displaying their contents to the rest of the immune system.

但这种抗原呈递细胞更加类似于,专职抗原呈递细胞,或者是体内免疫细胞中的一个亚群,专门从事吞噬异己物质,并告知免疫系统的其他细胞的工作

耶鲁公开课 - 生物医学工程探索课程节选

or like, for, if I have like anything I want to learn in my professional life or whatever, it's really easily available.

或者，如果我在以后职业上有什么要学，也可以在这里很容易找到。

开放式的课程？ - SpeakingMax英语口语达人

Blacks were not permitted to play on professional baseball teams or in any other major league sport.

VOA: special.2009.04.05

But still is very professional and you can use it in any setting, business or casual.

但它也同样可以是很专业的表达，可以用在商务或是生活的各种语境。

Is it okay 课堂 - SpeakingMax英语口语达人

These professional criminals often used force to take what they wanted -- cows,horses or money.

VOA: special.2010.03.10

I don't really have like a professional opinion or a very well-informed opinion.

我的观点并不专业，也不是很成熟。

关于干细胞的研究 - SpeakingMax英语口语达人

The job can be done with simple cutting tools or by hiring a professional shearer.

VOA: special.2010.09.07

Or they buy flowers from a local farmer's market instead of a professional florist.

VOA: special.2010.08.09

She sought help from the Maryland State Professional Outplacement Assistance Center,or POAC, which is funded by the state Department of Labor.

VOA: standard.2010.07.28

or NBA. After 10 years in professional sports, he returned to Princeton to finish his degree, a move,he says, that later influenced a career decision.

VOA: standard.2010.06.24

(OMITTED) Amateur prizes consist of trophies and merchandise, while professional purses can run as high as $2,500 or more at events like the world championships.

VOA: standard.2010.08.03

"What happens with the health outcome, depends upon good communication, the trust and credibility between the health professional and the individual seeking care, and an understanding of the patient's culture, value system, so that one can develop,hopefully, a strong relationship or interaction between the health professional and the individual.

VOA: standard.2010.03.05