profession
n.(自由)职业[the～]同行;公开表示
people who work in the professions(=doctors, lawyers etc)
从事专业性工作的人
professional
a.职业的，专业的 n.自由职业者，专业人员
What professional qualifications does he have?
他有哪些专业资格?
subtle
a.微妙的;诡秘的，狡诈的;隐约的
The pictures are similar, but there are subtle differences between them.
这些图片很相似，但它们之间有细微的差别。
succession
n.连续;一连串，一系列;接替，继任
She won the championship four times in succession.
她连续四次夺得冠军。
