慢速英语:Researchers: Driverless Scooter Provides Safe and Easy Ride

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1. avoid vt.避开，避免，预防
例句：The pilots had to take emergency action to avoid a disaster
飞行员不得不采取紧急措施避免灾难的发生。

2. wireless adj.不用电线的，用无线电波传送的
例句：They confirmed by wireless that she was picking up survivors.
他们通过无线电证实她在营救幸存者。

3. decrease vi.减少，减小
例句：Population growth is decreasing by 1.4% each year
人口增长率正在以每年1.4%的速度下降。

4. launch vt.发射; 发动
例句：The coach taught us how to launch a javelin.
教练教我们投标枪。

5. available adj.可获得的; 有空的; 可购得的
例句：Since 1978, the amount of money available to buy books has fallen by 17%
自1978年以来，可用于采购图书的经费已经减少了17%。