名词
中文翻译：信号示踪剂
同义词：
['tracer', 'tracer agent', 'tracer substance']
例句：
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1.The signal tracer was used to locate the lost hikers in the forest.
信号示踪剂被用来在森林中定位失踪的徒步旅行者。
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2.The scientist used a tracer to study the movement of water molecules.
科学家使用示踪剂来研究水分子的运动。
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3. The tracer helped scientists to better understand the behavior of the animals.
示踪剂帮助科学家们更好地理解动物的行为。