Read and translate the following text

Most walk-through detectors are manufactured for personal search of air passengers, but are often used for search of packages, personal belongings and luggage. The operational principle of such detectors may be defined as “Active field” technology. However, unlike the metal detectors of past years, modern designs feature many advancements which completely alter the characteristics of earlier years. The design 500 processes persons only in single direction.

The Exit Sensor System of walk-through detectors performs the following two important operations: deactivates the detector into a non-usage operational condition so that signals from nearby activity or ambient emission will not cause false alarm cycling during such non-use period and activates Evaluation Display for the just-processed suspect. During the second operation Operator's Viewer illuminates green-color “Clear”, or red-color “Alarm”. On special designs, an optional amber-color “Advisory” may be activated.

Should a suspect fail to proceed though the detector in a normal manner, interruptions in the electronic cycling can be expected. The detector anticipates a normal processing cycle of approximately three seconds per suspect and will automatically recycle itself in about twelve seconds. The recycling will occur if the suspect stops or delays overlong within the detector, or turns back and exits through the entry end.

Exercise 1. Answer the following questions.

1. What are walk-through detectors manufactured for?

2. How can we define the operational principle of such detectors?

3. What functions does the Exit Sensor System of walk-through detectors perform?

4. What does red colour mean?

5. What is the normal processing cycle of the detector?

Exercise 2. Say whether the following statements are true or false. Correct false statements.

1. Most walk-through detectors are manufactured for personal search of air passengers, but are often used for search of packages, personal belonings and luggage.

2. The operational principle of such detectors may be defined as “Passive field” technology.

3. However, unlike the metal detectors of past years, modern designs feature many advancements which completely alter the characteristics of earlier years. The design 500 processes persons only in single direction.

4. The Exit Sensor System of walk-through detectors performs the following three important operations.

5. Should a suspect fail to proceed though the detector in a normal manner, interruptions in the electronic cycling can be expected.