difficult副词和名词

副词形式：difficultly

名词形式：difficulty

例句：He faced difficulty in understanding the concept.

例句：The project has many difficulties.

常见搭配：

1. have difficulty (in) doing something：

She had difficulty (in) finishing the task.

2. with difficulty（艰难地）：

He climbed the mountain with difficulty.

3. overcome difficulties（克服困难）：

They overcame many difficulties together.

如果有其他疑问，欢迎继续提问！