Changes in the technological base of coal-fired power plants could restore their attractiveness, however. Whereas some of these changes are intended mainly to increase the productivity of existing plants, completely new technologies for burning coal cleanly are also being developed.
gre写作考试范文只是给考生作为一个参考作用,一方面考生可以背诵这些优秀的gre写作范文,另一方面应该从中举一反三,不要只是一味地背诵。
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