最终，人们试图改进莱斯·保罗的模型，应该说，是对其进行改良。

So eventually, people tried to improve on Les Paul's model, well, to modify it I should say.

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应急设施必须随着情况改善予以逐步改进或以简易坑式厕所、通风改良坑式厕所或节水型水冲式厕所予以替代。

Emergency facilities need to be progressively improved or replaced with simple pit latrines, ventilated improved pit latrines, or poor-flush latrines as the situation develops.

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该磋商小组在世界各地建立了中心，它们的工作人员是来自各种文化的研究人员。该小组负责改良作物品种及改进耕作方法，这些品种和方法对饥饿产生了深远的影响。

With centres around the world staffed with researchers from many cultures, the Group has been responsible for improved crop varieties and farming methods that have had a profound impact on hunger.

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