Translate the following sentence into Turkish.
Before being sent into the field... each new agent had to learn all the modern techniques of crime detection... such as the use of a specially treated X-ray mirror... through which an F.B.I. man can see without being seen.
Göreve gönderilmeden önce tüm ajanlar görünmeden görebilmeyi saglayan özel bir x-ìşìn aynasì gibi modern suçlu yakalama tekniklerini bilmek zorundaydì.