9
................................................
the movement of the ocean.
Propulsion
10
................................................
by six
electric thrusters, which make Alvin very
manoeuvrable. Three of them are for
forward and reverse movement, two for vertical
motion, and
a final thruster, right at the back of the vessel, turns the submersible
round.
Now we’ll turn to …
120
p h o t o c o p i a b l e r e c o r d i n g s c r i p t s
OBJECTIVE IELTS ADVANCED –
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© Cambridge University Press, 2006
©
Cambridge University Press
www.cambridge.org
Cambridge University Press
0521608759 - Objective IELTS Advanced Teacher’s Book
Michael
Black and Annette Capel
Excerpt
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