暴风雪过后，工人们开着扫雪车清理高速公路。

After the snowstorm, workers used ___snowplows to clear the highway.

市政府派出了铲雪车来清扫主干道上的积雪。

The city sent out ___snowplows to clear the main roads after the storm.

新手滑雪者应该先学会使用八字刹车来控制速度。

Beginner skiers should first learn to use ___snowplows to control their speed.