1.Today, the scientific name for living material that clings to rocks is cryptogamic cover.

今天，附着上的生物材料的名密码盖。机翻

2.Scientists have used modern cryptogamic covers to see how the first plants might have worn rocks down 500 million years ago.

们使用现代密码盖来了解第一批植物如何 5 亿年前磨损。机翻