我是说，随着人口增长，路上车辆更多了，机械也更多了，他们肯定不能只依赖于甘蔗（作为生物燃料）吧？
I mean, as the population grows and there are more vehicles on the roads and there's more machinery, surely they can't depend so much on sugar cane?
为快速增长的人口提供更多的食物是机械工程师的另一个角色。
Providing more food for the rapidly increasing population is yet another role for the mechanical engineer.
为快速增长的人口提供更多的食物是机械工程师的另一个角色。
Providing more food for the rapidly increasing population is yet another role for the mechanical engineer.
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