外推

wài tuī to extrapolate

式

shì type; form; pattern; style

窗户

chuāng hu window; CL:個|个[ge4],扇[shan4]

安全

ān quán safe; secure; safety; security

吗

ma (question particle for "yes-no" questions)

mǎ see 嗎啡|吗啡, morphine

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