noun🔗Share车辕, 辕, (also) 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了马车的辕木上。vehiclepartmachineagricultureChat with AIVocabulary GamePractice Reading
noun🔗Share煤层底板，煤层底部的浅层黏土。 The shallow stratum of underclay that lies under a seam of coal; the bottom of a coal-seam."The miners carefully removed the coal, being mindful of the slippery thill underneath to avoid a cave-in. "矿工们小心翼翼地移走煤块，注意着下面湿滑的煤层底板，以避免塌方。geologymaterialChat with AIVocabulary GamePractice Reading
