今日词汇
city-state城邦; 城市国家
testbed试验台
off-peak 非高峰期的
at the wheel 掌舵；指挥
原文（内容选自techxplore）
Singapore has moved a step closer to a driverless public transport network with the launch of a new trial of self-driving buses.
Orderly and high-tech, the Asian city-state has become a testbed for self-driving vehicles and has developed home-grown technology while inviting foreign companies to trial their own.
In a three-month trial launched this week, passengers can book a bus ride through an app that takes them around Singapore's Science Park, a high-tech business hub, during off-peak hours.
It is not the first self-driving bus trial in the city but is the first to charge a fee.
Singapore's first trial of self-driving buses came in 2015, while a trial of driverless road sweepers was launched earlier this year.
Despite the technology on the buses, a driver is still at the wheel to take control if necessary and must drive the bus manually along part of the route.
Khor Jing Qian, a 23-year-old student who took the bus to attend a scholarship interview on Wednesday, said the journey, which took about 10 minutes, was "convenient and easy".
The shuttles are also operating in another area of the city on a fixed schedule as part of the same trial, according to a statement from the Ministry of Trade and Industry.
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