Over the last five decades, improved farming techniques and technologies have helped to significantly increase crop yields along with a 12% expansion of farmed land use.
在过去50年里，改良的农业科技技术显著提高了农作物的产量，耕种面积扩大了12%。
2
At the start of this century, about one-third of crop workers were over the age of 35.
本世纪初，约有三分之一的作物工人年龄在35岁以上。
3
To ensure a good crop the soil had to be turned over twice.