hanging on to短语²⁸⁷²⁸ 基本例句 🌏紧紧抓住 Nationally, South Carolina ranks near the bottom in high school graduation rates, partly because so many rural schools here have trouble hanging on to their students. 在全国范围内，南卡罗来纳州的高中毕业率最低，部分原因是因为这里有这么多的农村学校，无法留住他们的学生。 yeeyan