黑

Hēi abbr. for Heilongjiang province 黑龍江|黑龙江[Hei1 long2 jiang1]

hēi black; dark; sinister; secret; shady; illegal; to hide (sth) away; to vilify; (loanword) to hack (computing)

帽

mào old variant of 帽[mao4]

mào hat; cap

seo 实战

shí zhàn real combat; actual combat

教程

jiào chéng lecture course; teaching module at university; tutorial; textbook; course of study

外推

wài tuī to extrapolate

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