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I suppose they're expressing their identity ...(Para. 10)
Meaning: I image they are telling people who they are ...
identity: n. who or what a person or thing is
It's very bad if one looses his identity. 人失去了自己的个性是很悲哀的。
I.D. card (identification card) 身份证
n. 身份的证明，视为同一，证明同一，确认
