By the late 1880s, the city had become too dense with buildings, sewers, and electric cables for the " cut and cover" technique, so a new system had to be devised.
十九世纪八十年代末,伦敦因楼房、污水管、和电缆外露而变得过于拥挤,原因是随挖随填技术,因此,人们需要设计新的设备。
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