橄榄枝"the olive branch”是整体名词作主语，谓语动词需用单数，即单三式，准确用means。但用mean不够恰当，mean”意思是; 意味着"。
橄榄枝象征和平。个人认为下列句子是最好的翻译，希望楼主能受用。
The olive branch represents peace.
The olive branch symbolize peace.
The olive branch stands for peace.
The olive branch is an emblem of peace.
The olive branch is the symbol of peace.
The olive branch is an emblem of peace.
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