difficult?

1. (指任務)需要精力或技術的,困難的[+to-v]
It's very difficult to swim across the Yangtze River.
游過長江很難。
Mathematics is difficult for some students.
有些學生覺得數學困難。
2. 難相處的,不隨和的
Mary was a very difficult child.
瑪麗過去是一個很難相處的孩子。
3. 艱難的,難熬的
The most difficult days are over.
最困難的日子已經過去了。

GOOD!

1. (指任務)需要精力或技術的,困難的[+to-v]

2. 難相處的,不隨和的

3. 艱難的,難熬的