fitting the arch first then fitting the girder  先拱后梁

a thousand-li journey begins with the first step  千里之行始于足下

Act Governing Replacement of Any Vacant Seat of the First Term National Assembly  第一届国民大会代表出缺递补补充条例

action of the first impression  新诉

adult of the first form  第一型成虫

After the arch  后拱

Age of the first spermatorrhea  首次遗精年龄

age of winning the first prize  魁龄

are the first shift and the second shift.Finally  地理信息系统(GIS)

associated container linesgroup of internationally known shipowners who formed the first company to use container ship  联合集装箱班轮公司

at the first blush  乍一看

at the first class section  处为一等

bearing structure of the arch gate  弧门支承体

Bessel function of the first kind  第一类Bessel函数; 第一类贝索函数; 贝塞尔函数; 第一类贝塞尔函数; 第一类贝塞耳函数

blocks of the first order  一级地块

Blood pressure at the first visit  首诊血压

Boll on the first stem node  第一果位铃; 上皮内淋巴细胞

Boundary Integral equations of the first kind  第一类边界积分方程

burst fracture of the first lumbar vertebra  L1爆裂骨折