It's the biggest transformation of the face without using any artificial aids.

这是在不使用任何人工辅助工具的情况下最大的面部改造。

Tariff walls, bounty systems, and all the other artificial aids to manufacturing have not developed this industry in foreign lands, and today the United States produces four-fifths of all the agricultural machinery used in the world.

关税壁垒、赏金制度和所有其他对制造业的人为援助并没有在外国发展这个行业，今天美国生产了世界上所有使用的农业机械的五分之四。