KET / PET 图像词汇，
真正记住也真正会用

Schoolboy Tim Freeman has come up with a clever idea to improve the efficiency of school buses. Tim Freeman was just twelve years old when he came up with a revolutionary idea that would make school buses more energy efficient. This would not only save money, but also help the environment. Five years later, the schoolboy finally saw his dream come true.

Free diving is a sport in which participants remain underwater while holding their breath for several minutes. In one free-diving event, athletes compete to see who can dive deepest without using an oxygen tank, the equipment normally used by professional divers who spend long periods underwater.