问题描述：
a particular of a subject or a activity是什么英语单词的意思
还有2个不知道意思
1.the scientific knowledge and equipment that is needed for a particular industry.
2.impressive and something frightenging;very good;excellent
还有2个不知道意思
1.the scientific knowledge and equipment that is needed for a particular industry.
2.impressive and something frightenging;very good;excellent
问题解答：
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