They did not work, either. By this time, the Union soldiers had become experts at digging canals.
此时，北方士兵一个个都成了挖掘运河的专家了。
Lacking experience in digging canals, they learned it through practical work.
缺乏修渠的经验就在实践中慢慢摸索。
Lacking experience in digging canals, they learned it through practical work.
缺乏修渠的经验就在实践中慢慢摸索。
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