他皱着眉头读那份复杂的报告。

He was ___furrowing his brow while reading the complicated report.

农民们正在用拖拉机在田地里犁沟，准备播种。

The farmers are ___furrowing the field with a tractor to prepare for planting.

雪地摩托在积雪中犁出一道深深的沟痕。

The snowmobile left deep ___furrowed tracks in the fresh snow.