免费

miǎn fèi free (of charge)

供需

gōng xū supply and demand

平台

píng tái platform; terrace; flat-roofed building

哪个

nǎ ge which; who

好

hǎo good; well; proper; good to; easy to; very; so; (suffix indicating completion or readiness); (of two people) close; on intimate terms

hào to be fond of; to have a tendency to; to be prone to

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