noun🔗Share车辕，辕木。 One of the two long pieces of wood, extending before a vehicle, between which a horse is hitched; a shaft."The farmer carefully attached the horse to the wagon's thills. "农夫小心地把马套在马车的辕木上。vehiclemachinepartChat with AIVocabulary GamePractice Reading
noun🔗Share底煤，煤底。 The shallow stratum of underclay that lies under a seam of coal; the bottom of a coal-seam."The miners carefully scraped away the last of the coal seam, being cautious not to damage the soft thills underneath. "矿工们小心翼翼地刮去最后一层煤层，谨慎地不要损坏下面柔软的底煤。geologymaterialsubstanceindustryChat with AIVocabulary GamePractice Reading
