written abbreviation forstandard adjective .标准的(standard的缩写)
[ C ] abbreviation forsexually transmitted disease 性传播疾病(sexually transmitted disease的缩写)
[ U ] abbreviation for subscriber trunk dialling: a system in the UK and Australia by which people make phone calls over long distances(英国和澳大利亚的)用户直拨长途电话(subscriber trunk dialling的缩写)
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