名词
中文翻译：Unknown
同义词：
['tracer', 'tracer agent', 'tracer substance']
例句：
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1. The shell tracer was used to detect the presence of oil in the seabed.
使用壳探针对海底石油的存在进行探测。
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2. The researchers used a tracer agent to study the movement of water molecules in the ocean.
研究人员使用一种示踪剂来研究海洋中水分子的运动。
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3. The tracer substance helped scientists to map out the distribution of minerals in the earth's crust.
示踪物帮助科学家绘制出地球地壳中矿物质的分布图。