短语
同心难改
t Think Straight
;
l can
积习难改的
chronic
;
inveterate
;
incorrigible
旧习难改
Old Habits Die Hard
;
set in one's way
个性难改
Boy will be boys
难改掉
die hard
本性难改
a leopard never changes its spot
积习难改
Hard habit to break
老狗难改吠声
an old dog cannot learn new tricks
难改出的螺旋
marginally recoverable spin