附图应当用制图工具和黑色墨水绘制，线条应当均匀清晰，并不得涂改。
The appended drawings shall be made in black ink with the aid of drafting instruments. The lines shall be uniformly thick and well-defined, and shall not be altered.
昨天他终于完成了用墨水描线。您知道，一个制图员往往先用铅笔打底，绘图完成后再用干面包屑擦去铅笔印。
You know, a draftsman always makes his drawing in pencil first, and when it's done he rubs out the pencil lines with stale bread crumbs.
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