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）。
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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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