名词
中文翻译：低频阶段
同义词：
['低频阶段，低频阶段，低频阶段，低频阶段']
例句：
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1.The low-frequency stage of the virus is when it first starts to spread.
病毒的低频率阶段是它开始传播的时候。
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2.In the low-frequency stage, the particles are still very small and dense.
在低频率阶段，粒子仍然非常小且密集。
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3. The low-frequency stage is a critical period for the virus to spread.
低频率阶段是病毒传播的关键时期。