求翻译：昌乐火山口，是很久以前火山喷发后留下的，历史有久。虽然它是一座死火山，但是从地质学上讲，他对地质学家的研究提供了很多证据，许多研究指导火山口做调查研究。是什么意思？

Changle crater, long ago left behind after the volcanic eruption, a long history. Although it is an extinct volcano, but geologically speaking, his geologist's study provides a lot of evidence, many studies do research to guide the crater.

chang-lok volcano eruption, is left behind after a long time ago, in a long history. Although it is a volcano, but from geology, geologists, he provided a lot of research evidence, many research studies done volcano guide.

The prosperous happy crater, after was the very long before volcanic eruption stays behind, the history had the long time.Although it is a dead volcano, but says from the geology, he has provided very many evidence to geologist's research, many research instruction crater does the investigation and

Changle crater, left behind by a long time ago after a volcanic eruption, history is long. Although it is an extinct volcano, but from the geological sense, his studies provide much evidence of geologists, research guidance crater to do research.

Changle crater, long ago left behind after the volcanic eruption, a long history. Although it is an extinct volcano, but geologically speaking, his geologist's study provides a lot of evidence, many studies do research to guide the crater.