difficult加上后缀的名词形式

difficult加上y变为名词，意思是：困难；困境；难题；难事；险境；难懂的事

常见搭配有：

have difficulty 有困难；有难度

great difficulty 很大的困难

have difficulty in 在…上有困难；做…有难度；难以

learning difficulty 学习困难；学习难度

difficulty level 难度水平；难度级别；难度等级

If he saw a trucker in difficulty, he would just bog in and give a hand.

如果他看到一个货运汽车司机有困难的话，他会非常热情地给予帮助。