第一
first; number one; primary
第一例
first case; first instance; first time (sth is done)
第一国际
First international, organized by Karl Marx in Geneva in 1866
第一基本形式
(math.) first fundamental form
第一夫人
First Lady (wife of US president)
第一季度
first quarter (of financial year)
第一时间
in the first moments (of sth happening); immediately (after an event); first thing
第一桶金
the first pot of gold; the initial profits from an economic endeavour
第一次
the first time; first; number one
第一产业
primary sector of industry
第一眼
at first glance; at first sight
第一声
first tone in Mandarin; high level tone
第一象限
first quadrant (of the coordinate plane, where both x and y are positive)
第一轮
first round (of match, or election)
一递一声
(of singers etc) one answering the other
先帝遗诏
posthumous edict of former emperor; Liu Bei's 劉備|刘备 edict to posterity
国语注音符号第一式
Mandarin Phonetic Symbols 1 (official name of the phonetic system of writing Chinese used in Taiwan); Bopomofo; abbr. to 注音一式[zhu4 yin1 yi1 shi4]
科学技术是第一生产力
Science and technology is the number one productive force (from 1978 speech by Deng Xiaoping 鄧小平|邓小平 introducing the Four Modernizations 四個現代化|四个现代化).