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parts of the system. The denser cold water sinks to displace the heated water, which is forced to rise. In this way, a circulation of water is set up-the process known as convection. The water rises up the primary flow (PF) into the hot-water storage cylinder, or tank, and is replaced by water descending the primary return (PR). If a temperature difference is maintained between the water in the primary flow and that in the primary return, then the process will continue. This is called the primaty circulation and it is made more effective by connecting the primary flow to the upper region of both the boiler and the cylinder, and the primary return to the lower region of each. If a draw-off point is opened, water will be forced from it because of the height of the water in the feed lank (often this tank is also the building's main cold-water storage cistern). The hot-water supply is drawn from the top of the storage cylinder, where it collects because its density is lower than that of the colder water.

Heating water causes the dissolved air contained in cold water to be released. Consequently, a vent pipe has to be taken from the top of the storage cylinder and carried up above the level of the water in the feed tank. The pipe allows air to escape from the system and, as a result, prevents the formation of air locks. A safety valve, set to operate at a certain pressure, is fitted to the system. Also, a draw-off point is fitted at the lowest part of the system so that it can be drained.

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Interviewer: I know you have been learning English for almost five years and you are planning to become an interpreter. What do you feel about learning grammar? Do you think your teacher spends too much or too little time on it?
ВЫ-.....
Int. So grammar is important, but not too much of it. But should it be taught in
isolation?
ВЫ-....
Int. With vocabulary — is it better to learn a few words at a time and practice them, rather than a lot of words by heart?
ВЫ-.....
Int. One of the problems for learners of English is phrasal verbs — to get on, to get along with and so on, and, of course, idioms. Is it a problem for you? Have you
learnt enough idioms to cope with?
ВЫ-,,,,,,
Int. So, make sure the idioms you learnt are up-to-date. Now, how about pronunciation?A lot of students find that hard.вы-,,,,,,
Int. What advice would you give to people who are just beginning to learn
English?
ВЫ-,,,,,,
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