英语翻译
Hecouldalsosendmanysignalswithamirror.Heusuallyusedthemirrortowarnsomeoneofdanger.Orhetriedtogettheattentionofapersonfaraway.Buthealsousedigtosendmessagesincode.Ofcourse,mirrorscouldbeusedonlywhenthesunwasshining.Atnight,Indiansusedfirearrowsforsignaling.
AnIndianalsosentsignalswithsmoke.Hemadeasmallfireofdrywood.Thenheputgrassofgreenbranchesonit.Heheldablanktoverthefireforaminute.Whenheremovedtheblanketfromthefire,therewasacloudofsmoke.Thenumberofcloudsofsmoketoldhismessageincode.
NowyoucanseethatIndiansdidn`tneedtolearneachother`slanguage.Theycouldtalktooneanotherbyusingsignalsorsignlanguage.
乔建良回答:
他还能通过镜子发送许多信号.他通常使用镜子来警告某人正处于危险.或者他试图得到远处的人的注意.但是他也发送密码信息.当然,镜子只能在太阳光线强的情况下使用.晚上,印度人使用火来发送信号.有一个印第安人还通过...