净空

wèi fáng zhǐ guò rè ér zài dēng de shàng fāng liú chū de jìng kōng

为防止过热而在灯的上方留出的净空

clearance above the light to prevent overheating

dài yǒu liǎng gè chú guì de shū guì kě xiǎn shì huò yǐn cáng mén de jìng kōng

带有两个橱柜的书柜，可显示或隐藏门的净空。

Bookcases with two cabinets that show or hide the clearance of the door.