Anyone in the U.S corn futures market could be forgiven for feeling seasick after the sharp swings of recent weeks.

国玉米期货市场上如有任何人对近几周玉米期货的大幅波动感到头晕目眩，这都是可以理解的。

And suddenly, the classroom was like the floor of the Chicago Mercantile Exchange, with everybody swapping corn-futures contracts in a trading frenzy.

突然间，教师就好像美国芝加哥商业交易所的楼层每个人都在交易潮中交换玉米的期货交易合同。