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重点讲解：
1. on board 在火车（或轮船、飞机）上；
The six astronauts on board will spend ten days in space.
飞船上的6名宇航员将在太空度过10天。
2. take off (飞机)起飞；
Three planes were standing on the tarmac, waiting to take off.
三架飞机停在跑道上，等候起飞。
3. break up （使）分裂；（被）拆分；(使）破碎；
When people saw the land, the ship had fallen into the ice and began to break up.
当人们看到陆地的时候，船却陷在冰块里并开始解体。
4. as to 至于…；
Medical opinion differs as to how to treat the disease.
关于如何治疗这种疾病医学界有不同的看法。
n. 转移 adj. 不断改换的 动词shift的现在分
