Ex.17 Translate the sentences, paying attention to the meaning of the marked words and phrases.

1. At present there exist laser devices of various sizes, big and small, the latter being widely employed in various branches of our industry.

2. These semiconductor devices are made both of germanium and silicon, the former being in a more advanced state of development.

3. In mechanics we are interested in two kinds of energy, namely, kinetic energy and potential energy, the latter being the energy of posi­tion while the former being the energy of motion.

4. On the one hand, platinum is one of the most useful metals, but on the other hand, it is too expensive to be widely used in industry.