company: a commercial business 侧重于商业enterprise:a business firm 侧重于公司institution: a society or organization founded esp. for charitable, religious, educational, or social purposes.主要指以慈善,宗教,教育及社会为目的的organization: an organized body, esp. a business, government department, charity, ect.侧重于组织,主要用于企业,政府部门,慈善团体等。