观光最好要么乘游览巴士，要么骑自行车。
在一辆前往贝尔法斯特的游览巴士遭到石块投掷之后，车上来自中国的一家人受到了惊吓。
A family from China has been left shaken after a bus they were touring Belfast in was pelted with stones.
在一项实验中，近200名参与者登上一辆双层巴士游览费城。
In one experiment, nearly 200 participants boarded a double-decker bus for a tour of Philadelphia.
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