Usage priority
Collins 词频等级为 1，建议结合例句记忆，而不是只背中文释义。
采取预防措施以防止性传播疾病的性行为。
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采取预防措施以防止性传播疾病的性行为。；(采取预防艾滋病等措施的)安全性交
Sexual activity engaged in by people who have taken precautions to protect themselves against sexually transmitted diseases (STDs).
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采取预防措施以防止性传播疾病的性行为。
Sexual activity engaged in by people who have taken precautions to protect themselves against sexually transmitted diseases (STDs).
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Collins 词频等级为 1，建议结合例句记忆，而不是只背中文释义。
Dictionary facts from ECDICT, WIKTIONARY.