大量的古生代植物聚集在水域边缘，并逐渐蔓延到地球的各个角落。

The communities of Paleozoic plants congregated at the water's edge and began to colonize the Earth's surface.

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我的教授研究古生代的植物群。

My professor studies flora of the Palaeozoic Era.

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中生代，广东植物区系成分发生了很大的变化，裸子植物大量繁盛，但总体上是在本区晚古生代华夏植物区系的基础上演化而来的。

In Mesozoic, Guangdong flora had a big change, the gymnosperm was prosperous, but it was evolved from the late Paleozoic Cathaysian flora as a whole.

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