手机

shǒu jī cell phone; mobile phone; CL:部[bu4],支[zhi1]

app 哪

nǎ how; which

na (particle equivalent to 啊 after noun ending in -n)

něi which? (interrogative, followed by classifier or numeral-classifier)

可以

kě yǐ can; may; possible; able to; not bad; pretty good

买

mǎi to buy; to purchase

球

qiú ball; sphere; globe; CL:個|个[ge4]; ball game; match; CL:場|场[chang3]

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