却

què

but

以

yǐ

to use

一来

yī lái

firstly, ...

一则

yī zé

on the one hand

一方面

yī fāng miàn

on the one hand

一旦

yī dàn

in case (something happens)

一经

yī jīng

as soon as

一边

yī biān

one side

不但

bù dàn

not only (... but also ...)

不仅

bù jǐn

not just; not limited to

不单

bù dān

not the only

不如

bù rú

not equal to; not as good a...