Humans have long been able to knap simple flint tools.

人类很早就会打磨简单的燧石工具。

The harder the flint is knapped, the brighter the light it emits.

燧石受到的敲打越厉害，发出的光就越灿烂。

They are knapping stones to make fire.

他们在敲击石头生火。

What's taking the bus so long? Maybe the bus driver took a knap.

公车怎么这么久？也许是司机在打瞌睡。

"We just have not invested in understanding ocean chemistry," says Knap.

克纳普还说道：“只是我们现在还没有投资研究海洋化学”。

Applicable for plains, mountains, wetlands, knap, rural area and highway transportation of bulk cargoes; with solid structure; beautiful, safe, reliable, durable.

适用于平原、山区、沼泽、丘陵、农村以及公路运输各类散装货物，该类车型结构牢固、造型美观、安全可靠、经久耐用。

And what I do is, I select a hard stone hammer, in this case a quartzite pebble about the size of a cricket ball, and I elect to hit it in one place - and this is where I start to knap.

我要做的就是，选择一块够硬的石锤，这次我选这块是个头有板球大小的石英岩卵石。先挑个地方锤下去，接着我就开始从这地方开始凿了。