.指某一种作物种植前所种的作物。例如水稻或谷子收获后播种小麦，水稻或谷子即为小麦的前作。
他们出发了，两人在前作为侦察员，两人殿后以防后方攻击。
They set off, two men out in front as scouts, two behind in case of any attack from the rear.
“她不应该受到这样的骚扰。”加拿大圭尔夫大学的植物生物学家安·克拉克说，她也在委员会面前作证。
"She shouldn't be harassed in this way," says Ann Clarke, a plant biologist at the University of Guelph in Canada who also testified before the commission.
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