Higher wheat prices are driving up the price of corn, which is even more sought-after as an animal feed when wheat is too pricey to be a substitute.

小麦价格的上升同时也拉高了玉米的价格，源于随着小麦价格的上涨，更多的人使用相对较便宜的玉米作为小麦的替代品。

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It can be compared to a car seatbelt-a precaution, but no substitute for safe driving.

这可以同轿车安全带相类比——是一项预防，但它并不能取代安全驾驶。

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But the bottom line is that nothing can be a substitute for keen and focused driving.

但底线是，没有任何东西可以代替渴望和重点驾驶。

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But in arguing for the bill, Howell misses the best argument for Google Glass: it will mostly be a substitute for texting while driving.

FORBES: Will Google Glass Prevent Deaths or Cause Them?

Cheap US gas is already driving down the price of the biggest substitute for generating electricity, coal, freeing it up for export to Europe, where it is displacing Europe's relatively highly-priced gas.

BBC: Burning issues for the world's future