contact tracing معنى"contact tracing" أمثلة على "contact" معنى "tracing" معنى "tracing" معنى "be in contact" معنى "be in contact with" معنى "contact" معنى "in contact" معنى "ray-tracing" معنى "tracing back" معنى "tracing paper" معنى "tracing service" معنى "weapon tracing" معنى "arrow-point tracing" معنى "central tracing agency" معنى "central-bearing tracing device" معنى "family tracing day" معنى "financial tracing unit" معنى "identification and tracing machinery" معنى "iterative ray-tracing" معنى "national animal tracing database" معنى "needle-point tracing" معنى "ray tracing (graphics)" معنى "ray-tracing simulation" معنى "remote explosive scent tracing" معنى "add a contact" معنى أمثلة Contact tracing revealed that the man had had prolonged close contact with two colleagues (a 22-year-old man and a 23-year-old man), who experienced clinical signs of infection before his disease onset.
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