1. to grasp (often fig.)
2. to control
3. to seize (initiative, opportunity, destiny)
4. to master
5. to know well
6. to understand sth well and know how to use it
7. fluency

1. (dialectal) continuously; constantly
2. (literary) a door
3. (literary) a single source; a single origin
4. (literary) a way; a means
5. a cannon
6. a door
7. a family; a clan
8. a kind; the same kind
9. a single source; a single origin
10. a skill
11. a style; a faction; a denomination
12. a subject of study
13. a way; a means
14. an event or occurrence
15. continuously; constantly
16. the same school or teacher

classifier: 門

1. very; quite
2. (also, often used before an adjective without intensifying its meaning, i.e. as a meaningless syntactic element)

1. difficult (to...)
2. problem
3. difficulty
4. difficult
5. not good

1. disaster
2. distress
3. to scold