Most of the time, when we deal with vectors, we don't draw these arrows anymore.
多数情况下,当我们处理矢量时,就不再画出这些箭头了
耶鲁公开课 - 基础物理课程节选
He's armed with spear and bow and arrows.
他配有矛,弓和箭。
耶鲁公开课 - 旧约导论课程节选
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