nǐ / xiān / liáng / yí / xià / mén / de / kuān / zhǎi / zài / jué / dìng / mǎi / bù / mǎi / zhè / zhāng / zhuō / zi

你先量一下门的宽窄，再决定买不买这张桌子。

Measure the width of the door first, then decide whether to buy this table.