Translate the text into Russian. There are many sources of power

There are many sources of power. Wind and water are the oldest ones. For centuries coal, oil, wind and water were widely used by man. They were used to produce steam and electricity.

Our time is the age of atomic energy. Scientists of many countries have been working hard for more than a century to find out the secret of the atom. Now the energy of the atom is applied to all the fields of man's activity.

The atom is the smallest piece of the substance which can exist independently. Atoms are electrically neutral, having no electric charge in their normal state. An atom consists of electrons, protons and neutrons. An electron is very small and it has a very small mass. It is negatively charged. The nucleus consists of a number of protons, each with a single positive charge and one or more neutrons, which have no charge. The amount of electricity of any proton is exactly the same as that of an electron. That is why all the atoms are electrically neutral. The electrical nature of atoms is only evident when one starts breaking them into pieces, electrons and others.

At the same time with large atomic stations smaller mobile electricity producing units have been created based on the discovery of radioactive sources – isotopes. Mobile nuclear installations may be carried by rail and then by transporters to the out-of-the-way regions even in areas having no roads. Such a station according to estimates can operate without being recharged for two years.

Today scientists are looking for new more efficient nuclear processes of producing energy. But it was only lately that the physicists understood that the process of producing tremendous energy by stars, including our Sun, was the very process they were looking for. Now we know that this thermonuclear process is called fusion and it takes place at fantastically high temperatures. It can be done only by imitating on the Earth the process that makes the Sun shine.

There are many difficult problems to overcome before thermonuclear power stations based on this process can become a reality, but the problem of fuel supply is the least of them: the oceans of the Earth are practically an inexhaustible source of deuterium which plays the decisive part in the fusion process and its extraction from sea water is neither complicated nor expensive.

In short, peaceful uses of atomic energy are vast – but we must stop using it on weapons of mass annihilation.

TEXT 4. WHAT IS ELECTRICITY?