运河系统；渠道网络
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运河系统；渠道网络；运河系统；渠道网络
a network of canals, typically artificial waterways used for navigation or irrigation
The ancient canal system still irrigates the fields today.
古老的运河系统至今仍在灌溉农田。
运河系统；渠道网络
a network of canals, typically artificial waterways used for navigation or irrigation
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