Familiar sales general flow and essential skill.
熟悉销售的一般流程和基本技巧.
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The ability to make a freehand drawing or sketch is an essential skill for every engineer.
随手作图的能力乃是每一位工程师所必备的技能.
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Being able to pull off this sort of trick is an essential skill in many professions.
对于某些从业者而言,这是一项不可或缺的职业技能.
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