I can't build a fire by rubbing two pieces of wood together.

我总不能靠磨擦两片木柴来取火吧。

We tried to make a fire by rubbing two pieces of wood together.

【rub】我们用两块木头相互摩擦，试图生出火来。

Most savages get a fire by rubbing two very dry pieces of wood together until they become so hot that at last the wood-dust catches fire.

大多数原始人的生火方法就是摩擦两块非常干燥的木块, 直到产生足够的热量来点燃木屑。