文档介绍：Unit 6
SDH
1
Contents
Revision
Pre-reading Activities
While-reading Activities
New words and phrases
anization
Text and translation
Post-reading Activities
Further Development of the Theme-related Specialized Knowledge
Assignments
2
Revision
Teacher uses the following exercise to help the students to revise the important expressions or phrases or sentences which were learnt in the study of last unit.
Teacher : When I say a phrase or an expression in Chinese, you respond by giving an English equivalent your learnt in the study of Unit 5.
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3
Revision
Teacher ( Chinese )
光纤学
光缆
光源
光电检测器
视频带宽
宽带业务
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Students ( English)
fiber optics
optical cables
light sources
photodetector
video bandwidth
broadband services
4
Pre-reading Activities
Ask the Ss the following question related to the theme of the text:
What is SDH? Do you know anything about SDH?
Possible answers: SDH is an International Standard for high-speed synchronous optical works---a Synchronous Digital Hierarchy.
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5
While-reading Activities / New words and phrases
Synchronous ['siɧkrənəs]
Approve ['əpru:v] ,审订,通过
Tributary ['tribjutəri] ,从属的,辅助的
Map [mæp] ,设计,映射,变换
Node [noud] ,结
Embark [im'bα:k] ,开始搞
Provision [prə'viʒ ən] ,预备
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6
While-reading Activities / New words and phrases
Essence['esns] ,精华,核心
In essence       本质上,实质上
Advanced [əd'vα:nst] ,前进的,高深的
Maintenance ['meintinəns] ,保养
Approximately [ə'prɔksimitli] ,大约地
Procedure [prə'si: ʤə] ,步骤,程序,手续
Overlay [ˏouvə'lei] ,涂盖层
modate [ə'kɔmədeit] ,提供,容纳
Unify ['ju:nifai] ,使一体
Configure [kən'figə] ,使具形化,构成
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7
While-reading Activities / New words and phrases
Gateway ['geitwei] ,入口,通道
Mode [moud] ,样式,模式
Variety [və'raiəti] ,多样化,各种各样
Cornerstone ['kɔ:nəstoun] ,柱石,基础
Permanent ['pə:mənənt] ,持久的
Lease [li:s]
Virtual ['və:tjuəl] ,假想的,拟的
Container [kən'teinə]
Section ['sekʃən] ,段,部分
Dimensional [di'menʃə