in difficulty. in difficulties 两者有什么区别如题

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in difficulty. in difficulties 两者有什么区别如题
in difficulty. in difficulties 两者有什么区别
如题

in difficulty. in difficulties 两者有什么区别如题
difficulties是difficulty的复数
这样你懂了吧,一个是代表很多在,一个只代表一种.