It is known that metals are very important in our life, and that

It is known that metals are very important in our life, and that they have found their greatest use in industry. All machines and engineering constructions have metal parts. Some of them consist of metal parts only. （4 分）
【正确答案】：众所周知，金属在我们的生活中非常重要，（1分）而在工业中的作用最为重要。（1分）所有的机器及工程建筑都有金属部件，（1分）其中一些完全由金属部件构成。（1分）