adj. used ; second-hand
这个规定也已经用于购买使用过的轮胎和内胎。
This rule has also been applied in the case of a purchase of used tyres and tubes.
我们不能扔掉用过的电池。
如何燃烧用过的口罩?
I used it so that they could record all of the books that they read about Japanese culture.
我用它是为了让孩子们能记录下,他们读过的所有有关日本文化的书。
And we can calculate that with the formula that we used, which was just n minus l minus 1 equals the number of nodes.
这个我们可以用我们以前用过的那个公式来计算,也就是节点数等于n减去l减去1
That will lead me to use a technique I mentioned again last time, called memoization.
这就使得我要是,用我上次提过的一种技术,也就是默记法。
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