amelioration

改进，改善英释中释nthe act or an instance of ameliorating or the state of being ameliorated

1 By dint of discussing political matters, vaguely and without precision, from the point of view of the general amelioration of the fate of all men, they came to say a little more than "yes" and "no.".当马吕斯把关于改善全民生活的政治问题含糊而不明确地摊在桌上谈时，他们相互要比说简单的“是”“不”稍稍多说了几句。

2 I've heard that Liebig has made some wonderful discoveries in the amelioration of soils..我听人说利比黑在改善土壤这方面有过很了不得的发现。