大约4万6千年前，在一种使用工具、高度智能的捕食者入侵后不久，澳大利亚主要的陆地生物发生了一些巨大的变化。

Something dramatic happened to Australia's dominant land creatures—somewhere around 46,000 years ago, strikingly soon after the invasion of a tool-wielding, highly intelligent predator.

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公路上有挡泥板的断裂声和油漆的刮擦声，这种小事故每天都会在路上发生成千上万次。

There was a crack of fenders and the sound of paintwork being scraped, the kind of minor mishap that occurs on roads thousands of times every day.

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该公司的无人驾驶汽车在美国已经成功地穿过了许多州，行驶了超过100万英里的路程，且目前为止只发生了一些小事故。

The company's self-driving cars have done well over a million miles across various states in the US, and until now have only reported minor accidents.

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