adj.成直角的(正交的)

Wall type:the exterior of fan has two terminals ,one side is bell-mouthed type, the other side is 90 degree rightangle flange type. 壁式：風扇外形兩端一邊是喇叭口型，一邊是90.

Some Netizen said that, the train hard place designs nobody nature tomanifest in two points: One is the seat back cushion has the rightangle; 有網(wǎng)友說，火車硬座設計無人性化體現(xiàn)在兩點：一是靠背成直角；