一对一

一对 yīduì #6,958

a pair / a couple

一点儿 yīdiǎnr HSK 1 #2,522

a little bit / a small amount

一旦 yīdàn HSK 5 #1,028

once (something happens) / in case / if

一定 yīdìng HSK 2 #204

surely / certainly / definitely

一点 yīdiǎn #203

a little; a bit / somewhat

一无所有 yīwúsuǒyǒu HSK 7 #4,907

to have nothing / to be penniless / not to have a thing to one's name

一下子 yīxiàzi HSK 5 #4,858

all at once / all of a sudden / in one go

以防万一 yǐfángwànyī #4,614

just in case / to be on the safe side

一秒 yīmiǎo #5,195

one second; a moment / an instant

一流 yīliú HSK 5 #5,200

top quality / first-rate / first-class