巴西1987 - 2007年的鸡产量增加了四倍，成为世界上最大的鸡肉出口国。
Brazil increased its production of chickens fivefold in 1987-2007 to become the world's largest exporter.
组织培养可以成为获得四倍体甜瓜的有效途径。
Tissue culture was a new and efficient way to obtain tetraploid melon.
2000年之后，当乙醇成为生物燃料源的时候，玉米的价格上涨了四倍。
The price of corn quadrupled after 2000 when ethanol became a source of biofuel, and some tobacco farmers switched to corn.
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