破产...

n.改进者，提高的人，改良物...

improver的音标：improver的英式发音音标为：[ɪm'pru:və]improver的美式发音音标为：[ɪm'pruvə]...

Aim To synthesize new type of octane number improver for gasoline, methoxyisobutyrate.目的合成一种新型汽油辛烷值改进剂─甲氧基异丁酸烷基酯.Cetane improver . Makes the engine run better at higher compression settings.碳氢化合物的改进物. 使引擎在高压缩比时运转较为顺畅.Cyc...

improverishment的音标：...