Canal engineer Canvass White solved one of the construction obstacles when he discovered how to create a cement that hardened underwater.
运河工程师Canvass White解决了一个施工难题，他发明了水下硬化水泥。
Canal engineer Canvass White solved one of the construction obstacles when he discovered how to create a cement that hardened underwater.
运河工程师Canvass White解决了一个施工难题，他发明了水下硬化水泥。
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