йʱķս˹ٻ, ֹзľ½ЧΧѵµʿ. , зȻЧΧ֮ѵµĲ. ͬ˲Ӻ;ý () ܵӰ.

Ҫٻߡ, ĻϷ [] ͼʾϰ, Ȼڵͼκεص㰴. , ʹô˷ĵص<link="topic:line of sight"></link>֮.
