旧式工作靴的鞋底通常会钉入防滑的平头钉以增强抓地力。

Old-fashioned work boots often had ___hobnails hammered into the soles for better grip.

这些登山靴需要装上防滑钉才能在湿滑的地面上行走。

These hiking boots need to be ___hobnailed to walk safely on slippery terrain.