A round of ammunition for a firearm that contains magnesium or another flammable substance arranged such that it will burn and produce a visible trail when fired in the dark.

意味（3）

The act or state of tracking or investigating something.

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意味（4）

A request to trace the movements of a person or an object, such as a shipment.

The next morning when she awoke, she told Darcy what had happened, and Darcy agreed that she should go to the police and this time ask them if they could put a tracer on her incoming phone calls, just in case he called again.

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意味（5）

A person who traces something.

意味（6）

A device or instrument used to assist in making tracings.

tracers

（ plural ）

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tracer

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tracer

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