英语近义次词区别...occupation,business,profession,employment的区别

occupation：
用以成为某个正常的生活来源的一项活动；行业
An activity that serves as one's regular source of livelihood; a vocation.
职业：用以成为某个正常的生活来源的一项活动；行业
An activity engaged in especially as a means of passing time; an avocation.
副业：尤指以此来消耗时间的一项活动；兼差
business:
职业,行业：一个人所从事的职业、工作或行业,
The occupation,work,or trade in which a person is engaged:
职业,行业：一个人所从事的职业、工作或行业：
the wholesale food business.
食品批发行业
A specific occupation or pursuit:
行业,业务：特殊的职业或工作：
the best designer in the business.
该行业最好的设计师
profession,
是指受过良好严格长期教育才能担任的工作,
An occupation requiring considerable training and specialized study:
职业：需要大量训练和专门学习的行业：
the professions of law,medicine,and engineering.
法律、医学、工程的职业
The body of qualified persons in an occupation or field:
同业,同行：某一职业或领域内有资格的人的整体：
members of the teaching profession.
教师行业的人员
employment
则表示仅受雇佣的关系
The act of employing.
雇佣：雇佣的行为
The state of being employed.
被雇佣的状态
The work in which one is engaged; occupation.
某人所从事的工作；职业
An activity to which one devotes time.
（某人）从事的活动：某人所投入时间的活动
The percentage or number of people gainfully employed:
就业率,受雇人数：受雇百分比或人数：,

occupation指行当，行业（中性词）
eg。He has no fixed occupation
business一般指商业业务
profession只具有渊博知识或受过专业培训的职业；从事脑力劳动的职业
employment应该指雇用, 使用, 利用, 工作, 职业 ，强调就业，应征吧