Accordingly, polling collectors typically use sticky tracer types: the APM system reports the value as unchanged in between all polling events. Figure 4 illustrates this pattern.

因而，轮询收集器通常使用粘附跟踪程序类型：apm系统在生成报告时将假定所有轮询事件之间的值不变。

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The researchers used a radioactive tracer to be sure that the slugs are actually producing the chlorophyll themselves, as opposed to just stealing the ready-made pigment from algae.

研究人员利用放射性示踪法确定，这种海蛞蝓确实能自己产生叶绿素，而不仅仅是从海藻那里偷取现成的色素。

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Key reagents, such as antibody, tracer, reference standard, and matrix should be characterized appropriately and stored under defined conditions.

关键试剂，如：抗体，示踪物，参考标准品和基质应适当定义并在规条件下储存。

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The isotope, known as a medical tracer, is made outside the United States by a complicated process requiring highly enriched uranium from nuclear reactors.

NEWYORKER: Fussbudget

His unit was caught in what Mr Ellicock describes as a Vietnam-style exchange of red and green tracer bullets.

BBC: London Marathon: Ex-paratrooper runs for record

The researchers knew this because they had introduced a radioactive tracer that selectively binds to the same type of receptor in the brain, the mu-opioid variety, as the endorphins.

ECONOMIST: Pain perception