农民们在田里犁出了一道道笔直的沟。

The farmer plowed straight ___furrows across the field.

他思考问题时，额头上会出现深深的皱纹。

When he thinks hard, deep ___furrows appear on his forehead.

农民用犁在田里耕出整齐的沟垄。

The farmer plowed straight ___furrows across the field.

他眉头上的皱纹显示他正在专注思考。

The deep ___furrows on his forehead showed he was concentrating hard.