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ABBREVIATION for standard 标准
STDs can be spread by people who don't know they are infected.
性传播疾病可以通过那些感染了这些疾病但本身并不知情的人传播。
Many people who have STDs don't actually know they're infected.
许多染上性传染病的人实际上并不知道他们已经感染了。
One of the most serious complications of STDs is pelvic inflammatory disease or PID.
盆腔炎(elvic inflammatory disease, PID)是性传播疾病并发症最严重的一种。
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