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twenty-one twenty-first 21st：第二十一

December十二月 | twenty-one twenty-first 21st第二十一 | the first of January 一月一

first aider：急救人员

first aid box 急救箱 | first aider 急救人员 | fission products 裂变产物

first class air fare：头等舱位飞机票价

Final Act of the United Nations Conference on International Commercial Arbitration;联合国国际商务仲裁会议最后文件;; | first class air fare;头等舱位飞机票价;; | first cluster of items;第一组项目;;

first approximation：首近似值

finite set 有限集 | first approximation 首近似值 | first derivative 一阶导数

first approximation：一级近似

firing time 点火时间 | first approximation 一级近似 | first class constraint 第一类约束

first approximation：第一近似

firm power 保证功率 | first approximation 第一近似 | first order delay 一次时滞

first mate：大副大副二副

first mate 大副 | first mate 大副大副二副 | first meridian 格林子午线

first fruits：初年度收益

first frequency doubler ==> 第一频率倍增器 | first fruits ==> 初年度收益 | first gear ==> 一档

first fruits：初熟的果子

Fill up the measure of one's fathers 充满祖宗的恶贯59 | First fruits 初熟的果子61 | First will be last, and last first 在前的将要在后, 在后的将要在前568

first cousin：嫡亲表兄妹

first child crisis 头胎危机 | first cousin 嫡亲表兄妹 | first degree relatives 第一近亲

Ontario moonstone：安大略月光石,安大略月长石

onicolo 玛瑙 | Ontario moonstone 安大略月光石,安大略月长石 | onychite 雪花石膏

She is vilified by the press for her controversial view：因她持有异议,新闻界对她横加挞伐

牐12. vilify 诽谤,中伤 | 牐燬he is vilified by the press for her controversial view. 因她持有异议,新闻界对她横加挞伐. | 牐13. decry 责难,诽谤