Ӣʱٻȳֹ֮Ϯ, ݻٵзũ洬. ڿũͽ洬Ҫʷ, شзľ. ȳ治ܹ, Դ˺.

ҪõзܻȳϮ,  [ȳ֮] ͼʾϰ, ȻҪлȳֹ֮ĵص㸽. , Ҫлȳֹ֮<link="topic:line of sight"></link>֮.
