touchwood

Dry fungus makes excellent touchwood for lighting a fire on a rainy day.

用法提示：这里 touchwood 是不可数名词，指生火用的易燃材料。

She stored the touchwood in a waterproof pouch so it would stay dry.

用法提示：touchwood 作名词，表示火绒，在句中作宾语。

Without touchwood, starting a fire in the damp forest is nearly impossible.

用法提示：touchwood 作名词，强调生火所需的材料。