名词
中文翻译：圆珠笔
同义词：
['ball pen', 'ballpoint pen', 'fountain pen']
例句：
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1.She wrote a letter using a ball-point pen.
她用圆珠笔写了一封信。
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2.The teacher asked the students to use ball-point pens for their assignments.
老师要求学生们使用圆珠笔来完成作业。
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3.The ball-point pen was easy to write with and had a smooth tip.
圆珠笔书写流畅，笔尖平滑。