1. 可数名词：（大学，银行等规模大的）机构
2. 可数名词：慈善机构；社会福利机构
3. 可数名词：（由来已久的）风俗习惯，制度
4. 不可数名词：建立；设立；制定
5. 可数名词：（某地或工作中的）出名的人
英语解释
- a custom that for a long time has been an important feature of some group or society
- an establishment consisting of a building or complex of buildings where an organization for the promotion of some cause is situated
- an organization founded and united for a specific purpose
- the act of starting something for the first time; introducing something new
- a hospital for mentally incompetent or unbalanced person
institution是什么意思,institutio