凸凹不平的石墙就像一条很深的运河的河岸。The rough rock walls were like the sides of a deep canal.在这片以石墙隔出巴掌大的农田的乡村，驴子比汽车还多。Donkeys outnumber cars in this landscape of tiny stone-walled fields.有20人被倒塌的石墙砸伤。Twenty people were injured by falli...
水的导热速度比空气快。Water conducts heat faster than air.惯性项和那些与X方向的导热有关的项也被略去.The inertia terms and those relating to conduction in the X direction were also negligible.常用介质有: 水蒸汽 、 导热油 、 热水、冷却水等.The normal media are: steam, ther...