fèn bǐ jí shū
to write at a tremendous speed
奋
fèn
to exert oneself (bound form)
笔
bǐ
writing brush; writing implement (pen, pencil etc) (CL:支[zhi1],枝[zhi1])
疾
jí
(bound form) disease; ailment
书
shū
abbr. for 書經|书经[Shu1 jing1]
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