Английский язык. Арланова Т.Л - 15 стр.

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15
The explanation consists of a series of at least six steps. The first step is:
1 Current flows through the magnet coil.
The last step is:
6 The train is lifted.
Can you think of any of the steps in between?
Explanations consist of a series of steps. Some steps in an explanation have
cause and effect links; others have time links. Here are some of the steps
which explain how the train is lifted. What kinds of links are there between the
stages?
1 Current flows through the magnet coil.
2 The current creates a magnetic field round the poles.
3 The field induces a current in the track.
4 The track becomes magnetized.
5 The two magnets attract each other.
6 The train is lifted.
You can show cause and effect links in these ways:
1+2 Current flows through the magnet coil, creating a magnetic
field round the corners.
3+4 The field induces a current in the track; therefore the track becomes
magnetized.
5+6 The two magnets attract each other, (thereby) lifting the train.
Thereby can be omitted from the last example.
Exercise 12. Study these diagrams. They explain how the propulsion system
operates.
The train is propelled by a linear-induction motor mounted under the vehicle.
The current creates a linear travelling field which constantly reacts with the
aluminium secondary track, causing relative motion. To stop the train the
current is moved.

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