And we said that most of the world's volcanoes occur at the boundaries of these tectonic plates where you have hot molten rock squeezing up through gaps between the plates.
类似于这样的表达,And we said that most of the world's volcanoes occur at the boundaries of these tectonic plates, 重点来了,hot molten rock squeezing up through gaps between the plates.
这是口语体,为了表达生动,让读者或听众有参与感。you在这里为不定代词,等于one, people等,have意为经历, 后接doing形式作宾补,经历某事发生。如果只是冷冰冰的陈述事实,则可以说where hot molten rock squeezes up through gaps between the plates.