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因为他没有钢笔，他用一支铅笔代替。
As he had no pen, he used a pencil instead.
youdao
第一遍只是浅浅地在金属表面留下划痕，代替铅笔的作用；
The first time was to leave a unwipeable mark on its surface, in place of pencil's;
我们用铅笔来代替钢笔。
We substituted pencils for pens.
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