供需

gōng xū supply and demand

理论

lǐ lùn theory; CL:個|个[ge4]; to argue; to take notice of

的

de of; ~'s (possessive particle); (used after an attribute); (used to form a nominal expression); (used at the end of a declarative sentence for emphasis)

dí really and truly

dì aim; clear

dī see 的士[di1 shi4]

内容

nèi róng content; substance; details; CL:個|个[ge4],項|项[xiang4]

是

shì is; are; am; yes; to be

shì variant of 是[shi4]; (used in given names)

什么

shén me what?; who?; something; anything

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