Sìhéyuàn sì miàn dōu yǒu yuànqiáng, cóng wàimian kànbudào lǐmian.
A siheyuan has walls on all four sides, so you can't see inside from outside.
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culture
Homes in old northern China turned their backs to the street: the rooms face an inner yard, and a passer-by sees only the 院墙 and the gate, as in a 四合院.
