名词
中文翻译：周期条
同义词：
['periodical', 'periodic', 'periodical strip']
例句：
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1.The scientist used a period strip to measurethe length of the sample.
科学家使用一个周期条来测量样品的长度。
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2. The researcher found that the period strips werenot accurate enough for their purposes.
研究员发现，这些周期条对于他们的目的来说不够准确。
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3. The teacher explained how to usea period strip to mark the beginning andend of a sentence.
老师解释了如何使用周期条来标记句子的开始和结束。