among groups短语⁷⁹⁹⁷⁸⁺⁹ 基本例句 组间 Historically, women were much more involved in farming among groups that did not use ploughs. 历史上，女人在种群中更多地参加到没有使用犁的农业中。 ecocn Sri Lanka: The HIV epidemic remains at a low level, even among groups engaged in high-risk behaviors, in Sri Lanka. 斯里兰卡：在斯里兰卡，艾滋病病毒的流行程度很低，即使是在高风险行为群体内也是如此。 worldbank