Exercise 3. Paraphrase the following sentences

1. However, unlike the metal detectors of past years, modern designs feature many advancements which completely alter the characteristics of earlier years.

2. The detector anticipates a normal processing cycle of approximately three seconds per suspect and will automatically recycle itself in about twelve seconds.

3. The design 500 processes persons only in single direction.

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

5. The recycling will occur if the suspect stops or delays overlong within the detector, or turns back and exits through the entry end.

Exercise 4. Finish the sentences.

1. Most walk-through detectors are manufactured for...

2. The operational principle of such detectors may be defined as...

3. The Exit Sensor System of walk-through detectors performs the following two important operations:...

4. During the second operation Operator's Viewer illuminates...

5. The recycling will occur if...

Exercise 5. Make up your own sentences using the following terms:

walk-through detectors, operational principle, Exit Sensor System, recycling, Active field technology, non-use period, suspect, electronic cycling interruptions.

Unit 5. Aviation Impact on Environment

Text 1.