改寫英語(yǔ)句子,寫的更加簡(jiǎn)潔,準(zhǔn)確,informative（提供信息的）!
將下面18個(gè)句子改寫的concise ,accurate,informative!必有積分重謝!
1,the high temperature had the effect of making the metal softer.
2,an investigation of all possible alternatives was undertaken.
3,three qualities of tungsten steel alloys are strength,ductility and they
have to be tough.
4,accidents can be either injury producing or can damage property.
5,there is a great deal to be explained in the area of unidentified flying objects
6,the aim of census analysis is to predict the expected population at some specified
future date.
7,the voltage must be definitely checked at periodical intervals.
8,the soldering proved to be of an unsatisfactory nature.
9,the use of this method would eliminate the problem of motor damage.
10,a scientist must obtain adequate evidence if he wants to prove a theory.
11,scientific instruments and machines frequently need to be adjusted before they are used
12,in the case of radiation studies it was found that...
13,it is on the basis of recent research that the newer system is proposed.
14,sulfuric acid was employed in the removal of surface impurities from the specimen.
15,in an early report,a new equipment design was outlined and a new method of fabrication
was described.
16,many of those theories could be either disproved or substantiated.
17,expectation is forbidden.
18,the experiment was delayed for awhile because of unfavorable weather conditions.