这些水渠往往要凿通岩石，并需要地道、引水沟、弯管、渡漕和混凝土水道。
These canals are frequently excavated through rock, and require tunnels, flumes, syphons, aqueducts and open concrete-lined channels.
石斧可不是你乱凿一通就可以整出来的东西，它们可是经验的成果，凝结着精心设计与高超技艺，这些都得通过一段相当长期的学习与提升。
Handaxes are not things you knock off; they are the result of experience, of careful planning and of skill, learned and refined over a long period.
石斧可不是你乱凿一通就可以整出来的东西，它们可是经验的成果，凝结着精心设计与高超技艺，这些都得通过一段相当长期的学习与提升。
Handaxes are not things you knock off; they are the result of experience, of careful planning and of skill, learned and refined over a long period.
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