| IV. Translate the following text into your native language:
Synthetic plastic materials are now being used in almost every type of industry for one purpose or another. They are available in practically all colors and for almost all purposes where metal can be used, except where a very high degree of strength is required. They are lighter in weight than any common metals and are sufficiently hard to take the place of metal parts for most purposes.
Plastics are synthetic in the sense that they do not occur naturally. The molecules are composed principally of carbon, hydrogen, nitrogen and oxygen, which are derived from petroleum, coal, salt, air and water. Their properties depend ,to some extend, on size of the molecules of which they are composed.
The modern plastics industry deals chiefly with materials manufactured from organic compounds.
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