It is associated with a particular role or a major category.

它与一个特定的角色或者一个主要的分类相关联。

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Thee rubber is another major category in nonmetal materials.

橡胶是非金属材料的另一大类。

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Skin care products will become the major category in the cosmetic market.

护肤品已成为化妆品市场的主导。

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We don't expect everybody to be a course six major, contrary to popular opinion, so for those are you not in that category, the second thing we want to do is we want to help students who don't plan to major in course six to feel justifiably confident in their ability to write and read small pieces of code.

和大众意见正相反，我们不希望所有人都变成course，six的主修学生，所以对于那些不在第一梯队里的人来说，我们想做的第二件事情就是,希望帮助还不想,主修这门课的人,都能获得在自己能力范围内,读写小编码的自信。

麻省理工公开课 - 计算机科学及编程导论课程节选

And three to five of those hurricanes will be in the major category, or Category 3 strength and higher.

NPR: Hurricane Center Weathers Own Storm

There are signs all around that we are closing in on an extraordinary and previously unheard of juncture in nearly every major category--social, educational, political, lifestyle and employment.

FORBES: Leadership

From 2001 to 2011, tuition and fees at state schools increased 72 percent, and tuition costs are now rising faster than any other major category of expenses, including healthcare.

FORBES: 5 Reasons the Student Loan Crisis is Nothing Like the Mortgage Crisis