dì yī cì 
		the first time
first
number one
		 
		
		
		
		
			 
		
				
		
			dì yī lún 
		first round (of match, or election)
		 
		
		
		
		
					
				
		
			dì yī rén chēng 
		first person (in writing)
		 
		
		
		
		
			 
		
				
		
			dì yī jì dù 
		first quarter (of financial year)
		 
		
		
		
		
			 
		
				
		
			dì yī fū rén 
		First Lady (wife of US president)
		 
		
		
		
		
			 
		
				
		
			dì yī shēng 
		first tone in Mandarin
high level tone
		 
		
		
		
		
			 
		
				
		
			dì yī tǒng jīn 
		the first pot of gold
the initial profits from an economic endeavour
		 
		
		
		
		
			 
		
				
		
			shì jiè dì yī 
		ranked number one in the world
the world's first
		 
		
		
		
		
			 
		
				
		
			tiān xià dì yī 
		first under heaven
number one in the country
		 
		
		
		
		
			 
		
				
		
			dì yī chǎn yè 
		primary sector of industry
		 
		
		
		
		
			 
		
				
		
			dì yī lì 
		first case
first instance
first time (sth is done)
		 
		
		
		
		
			 
		
				
		
			kē xué jì shù shì dì yī shēng chǎn lì 
		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).
		 
		
		
		
		
			 
		
				
		
			dì yī guó jì 
		First international, organized by Karl Marx in Geneva in 1866
		 
		
		
														
		
		
			 
		
				
		
			dì yī xiàng xiàn 
		first quadrant (of the coordinate plane, where both x and y are positive)
		 
		
		
														
		
		
			 
		
				
		
			dì yī jī běn xíng shì 
		(math.) first fundamental form
		 
		
		
		
		
			 
		
				
		
			Guó yǔ zhù yīn fú hào dì yī shì 
		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]
		 
		
		
														
		
		
			 
		
				
		
			dì yī shí jiān 
		in the first moments (of sth happening)
immediately (after an event)
first thing