armband：臂章；臂带；（戴在上臂的）袖标。常用于表示身份、职务、立场或纪念（如队长袖标、志愿者臂章、丧礼黑纱等）。
/ˈɑːm.bænd/
He wore a red armband to show he was a volunteer.
他戴着一条红色臂章来表明自己是志愿者。
The captain tightened his armband before leading the team onto the field, a small symbol of responsibility that everyone recognized.
队长在带领球队进场前把袖标系紧——那是一个虽小却人人都懂的责任象征。
armband由 arm（手臂）+ band（带子、束带）组合而成，字面意思就是“绑在手臂上的带子”。后来引申为具有标识、纪念或象征意义的“臂章/袖标”。
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