specific 强调内容明确，毫不抽象、笼统。
express 语气较强，较正式，指不但清楚明确，而且含有直截了当和有力等的意思。
例句：
It was important for children to learn to express themselves clearly.
孩子学会清楚地表达自己很重要。
Many artists express their world view in their work.
很多艺术家通过作品表达自己对世界的看法。
I would like to express my warmest thanks to the doctors.
我想向医生们表达我最由衷的感谢。