释义： n. 三十年代 num. 三十 展开释义 例句： He was a young man at his early thirties. 他是个三十岁出头的年轻人。 The cost of swimming classes is thirty dollars per semester. 游泳课的费用为每学期30美元...

发布时间：2025-10-31 浏览量：1