You should write your homework in ink, not with a pencil.
你应该用钢笔做作业，而不能用铅笔。
With my own hands I ruled it with pencil lines, at not very regular intervals, and thereon I began to write verses in a large childish scrawl.
我亲手用铅笔在里边划上一些大小不均的杠杠，开始在上面涂上诗句。
Literally, you could not pick up a pencil off a bench if you were working with embryonic stem cells.
名义上说，如果要是在搞胚胎干细胞的工作，你就不能从凳子上拿走一支笔。
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