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It's the trend that SDH will replace PDH in building information highway.
代替pdh的传输体制是高速信息公路的建设的未来趋势。
youdao
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The access-network is necessary in the construction of the information highway.
信息公路要有接入网配套。
youdao
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The access-network is necessary in the construction of the information highway.
信息公路要有接入网配套。
youdao