bù duàn
unceasing
uninterrupted
continuous
constant
yuán yuán bù duàn
a steady flow (idiom); an unending stream
jiē lián bù duàn
in unbroken succession (idiom)
cháng liú shuǐ , bù duàn xiàn
continuous and patient effort (idiom)
fēng bō bù duàn
constantly in turmoil
crisis after crisis