matter.trouble.problem.difficulty可数,不可数

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matter.trouble.problem.difficulty可数,不可数
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matter.trouble.problem.difficulty可数,不可数
matter.trouble.problem.difficulty可数,不可数

matter.trouble.problem.difficulty可数,不可数
trouble不可数,
matter ,problem 可数
difficulty 做“困难”解,不可数,做“困难的事”可数

都可数

全可数 例句:
There are several important matters we should discuss.
solve a problem
Hhere are some difficulties in reaching an agreement.