񰢶߯˹ǿҵĵȻķŭ. ڵÿһ֧ӶܵӰ, ܵ˺, ҽԶȲ. ũܵƻǳС.

Ҫǿƻ, ĻϷ [ضɽҡ] ͼʾϰ, ȻڵͼϣΪĵĵص㰴. , õص<link="topic:line of sight"></link>֮.
