查询词典 First impressions are firmly entrenched.

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;;

think alike：英雄所见略同

243. First come first served. 先到先得. | think alike. 英雄所见略同. | 245. He has a sense of humor. 他有幽默感.

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 approximation：首次近似

finsler manifold 芬斯莱廖 | first approximation 首次近似 | first axiom of countability 第一可数性公理

Frist assistant director：第一助理导演

First assistant camera 第一摄影助理 | Frist assistant director 第一助理导演 | First assistant film editor 第一助理剪辑

material at first hand; first-hand material：第一手材料

第一生产力primary productive force | 第一手材料material at first hand; first-hand material | 第一双打first pair

AT FIRST SIGHT：乍一看(之下)

at best 充其量,至多 | at first sight 乍一看(之下) | at first 最初,首先,开始时候

cold-work mould steel：冷作模具钢

oxidation-resistant steel抗氧化钢 | cold-work mould steel冷作模具钢 | gauge and cutter steel量具刃具钢

Rise and fall saw：升降锯

rise-and-fallpendant升降吊灯 升降压吊灯 | rise-and-fall-saw升降锯 | risedcosine上升余弦