那些只教人读书的带一管笔，教人读又教人算的带两管，教人读算和拉丁文的带三管。

Those who teach reading only have one pen; those who teach reading and reckoning have two pens; those who teach reading, reckoning, and Latin have three pens.

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身处清初西学进入中国之际，江永一方面从传统文献中学习我国古代天算知识，另一方面又 积极吸取西方先进天算知识。

During the Western learning coming in the early Qing Dynasty , JiangYong on the one hand studied the ancient knowledge of chronometer and mathematics from the traditional documents of we country.

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You can go ahead and use that equation, or you could figure it out every time, because if you know the total number of nodes, and you know the angular node number, then you know how many nodes you're going to have left.

你们可以直接用这个方程，或者每次都自己算出来，因为如果你们知道了总的节点数，又知道角向节点数，就知道剩下的节点数是多少。

麻省理工公开课 - 化学原理课程节选