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.

拖拉机在田野里犁出了深深的沟痕。

The tractor ___furrowed deep lines in the field.