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BNC: 22266 COCA: 18424

tracer

1 ENTRIES FOUND:
tracer /ˈtreɪsɚ/ noun
plural tracers
tracer
/ˈtreɪsɚ/
noun
plural tracers
Learner's definition of TRACER
[count]
: a type of bullet that shows its path by creating smoke or light as it moves through the air曳光弹
medical : a substance that is put in a patient's body so that doctors can watch a biological process (such as digestion) or see how a condition (such as cancer) is progressing示踪剂;显光剂

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