1. If the plow can grasp taxiing and plow braking, we can try to learn from down-turn. 如果已能掌握犁式滑行及犁式制动,就可以试着学习犁式转弯。
2. The old and the new: a tractor and plow, in front of a pair of oxen pulling a plow. (Courtesy of the Library of Congress, Prints &Photographs Division, LC-USZ62-55902. 旧与新:两头牛拉著犁耕地,走在前面的是拖引机驱动的犁。(图片由美国国会图书馆印刷品及照片部提供。)
3. The old and the new: a tractor and plow, in front of a pair of oxen pulling a plow. (Courtesy of the Library of Congress, Prints &Photographs Division, LC-USZ62-55902. 旧与新:两头牛拉着犁耕地,走在前面的是拖拉机驱动的犁。(图片由美国国会图书馆印刷品及照片部提供。)
4. The old and the new: a tractor and plow, in front of a pair of oxen pulling a plow. (Courtesy of the Library of Congress, Prints &Photographs Division, LC-USZ62-55902. 旧与新:两头牛拉著犁耕地,走在前面的是拖引机驱动的犁。(图片由美国国会图书馆印刷品及照片部提供。)
5. The old and the new: a tractor and plow, in front of a pair of oxen pulling a plow. (Courtesy of the Library of Congress, Prints &Photographs Division, LC-USZ62-55902. 旧与新:两头牛拉着犁耕地,走在前面的是拖拉机驱动的犁。(图片由美国国会图书馆印刷品及照片部提供。)