美式橄榄球联盟发布处罚新规

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national anthem - n. a song that praises a particular country and that is officially accepted as the country's song

knee - n. the joint that bends at the middle of your leg

unpatriotic - adj. not having or showing love and support for your country : not patriotic

union - n. an organization of workers formed to protect the rights and interests of its members

challenge - v. to say or show that (something) may not be true, correct, or legal

collective bargaining - n. talks between an employer and the leaders of a union about how much a group of workers will be paid, how many hours they will work, etc.

awareness - n. knowledge of a fact or situation

perception - n. the way you think about or understand someone or something

stadium - n. a very large usually roofless building that has a large open area surrounded by many rows of seats and that is used for sports events, concerts, etc.

curious - adj. having a desire to learn or know more about something or someone