Not surprisingly the big semi-trailers take skill to handle-and they consume a lot of diesel.
一点也不奇怪的是，驾驶大型半拖车需要很高的技术，并且消耗大量柴油。
2
A typical semi-trailer travels about 240,000km (150,000 miles) a year, and even at $3 a gallon for diesel BMI estimates that its system would pay for itself in 12 to 18 months.
A typical semi-trailer travels about 240, 000km (150, 000 miles) a year, and even at $3 a gallon for diesel BMI estimates that its system would pay for itself in 12 to 18 months.