This is the cap of my fountain pen.
这是我的钢笔笔帽。
The cap of the pen is missing.
那支钢笔的盖不见了。
我把钢笔帽弄丢了。
Can you twist the cap of this fountain pen off?
你能把这钢笔帽拧下来吗？
I can't get the cap of this pen off. (I can't remove it.)
我无法取下这枝笔的笔帽。
One day later, Liu found his cap for a pen in his drawer.
一天后，刘在他的抽屉里发现了一个笔帽。
One day later, Liu found his cap for a pen in his drawer.
一天后，刘在他的抽屉里发现了一个笔帽。
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