I looked for my pen for one hour but I failed to find it.
我找了一个小时我的钢笔但还是没有找到。
He has only one pen, but I have two.
他只要一枝钢笔，但我有两枝。
Excuse me, but there is one slip of pen in the material I gave you.
不好意思，我给你的材料中有一处笔误。
Excuse me, but there is one slip of pen in the material I gave you.
不好意思，我给你的材料中有一处笔误。
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