The carpenter laid the purlins across the roof beams and then nailed on the rafters.
Tips
history
檩 is a specialist carpentry term that almost never stands alone in modern Chinese; it appears as 檩条 or 檩子. Built on the wood radical 木 with phonetic 禀, it survives mainly in traditional building vocabulary.
memory
Wood radical 木 plus 禀 (to receive / bear): a wooden timber that bears the weight of the roof above.
