֮صķɸݵ<link="topic:line of sight">Ұ</link>, Թۿͼκε, ʹδ̽.

Ҫٻ͸ۡ,  [͸] ͼʾϰ, ȻڵͼҪκεص㰴. ʹ͸ʱ׼<link="topic:black map">ɫͼ</link>ϵκλ, ǵ֪ںδ˽ֽʱЧ. ͸ҲΪ;. Ȼʩڵͼϵκһ, á͸ۡȡ<link="topic:line of sight">Ұ</link>, ʱֻҪպù׼һ, ı, ҲܽõҰ.
