Telephones002758赵志强.ppt

文档介绍：Telephones
主讲:赵志强
Alexander Graham Bell's Telephone
Alexander Gram Bell speaks into his telephone
Early Telephones
The way telephones work
transmitter传送器
fluctuate波动
destination目的地
duplicate复制品
instantly立刻
cable电缆
generate产生
switching station转换台
a series of一系列
antenna 天线
How a celluartelephone works
Radio Waves
correspond反应
frequency频率
horizon地平线
adjust调节
bounce off反弹
tuner调钮
The modern means munication
access路径
convert 传送
modem调制解调器
launch发送
commercial on-line service在线商业服务
individually独自地
cluster一串;一簇
eventually最后