2. Ten years ago, smooth plastic sleds became popular; they go faster than wooden sleds but are harder to steer and slow. 十年前,光滑的塑料雪橇开始流行起来;它们比木制雪橇跑得快,但是很难操控,也很慢。
3. It would be nice to go faster and break the world record. 再快一些,打破世界纪录就好了。
4. "That's right," said he, "but go faster." “就是这样。”他说,“但是要快点。”