名词
中文翻译：踪迹物质
同义词：
['trace substance', 'trailing substance', 'tracer substance']
例句：
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1. The teamfollowed the trail of the lost dog.
团队沿着失踪狗的踪迹找到了它。
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2.The scientist used a tracer substance to study the movement of water molecules.
科学家使用一种示踪剂来研究水分子的运动。
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3.The police were able to follow the trail of the thief through the city streets.
警方能够通过城市街道追踪到小偷的踪迹。