Ȼа֮Ǿ, ֻԴҽġq·ĳѨٻ.

ķٶȺ, ĻԴݻٵзĲӺͽ. ֻԶ๥ӿԹ, ˹֮ķܹ. ϧ޷, һֱֵ, ҽƿ.

Ҫٻ,  [֮ٻ] ͼʾϰ, Ȼ<link="topic:line of sight"></link>֮ڵκһط.
