I can only afford to watch television for an hour gonight because I have homework to do.
因为我要做家庭作业,所以今晚我只能花一小时看电视。
but more often than not, the greater part of the journey is spent on roads with few service stations and too much traffic.
但旅行的大部分时间都花在路上,而且只有很少的服务设施,交通也很拥挤。