外推

wài tuī to extrapolate

代

dài to substitute; to act on behalf of others; to replace; generation; dynasty; age; period; (historical) era; (geological) eon

发

fā to send out; to show (one's feeling); to issue; to develop; to make a bundle of money; classifier for gunshots (rounds)

fà hair; Taiwan pr. [fa3]

需要

xū yào to need; to want; to demand; to require; requirement; need

什么

shén me what?; who?; something; anything

工具

gōng jù tool; instrument; utensil; means (to achieve a goal etc)

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