1. It was probably once connected to South America, but the continents separated as the earth’s plates moved.
澳洲很可能曾经同南美洲连在一起，但是随着地球板块的活动而分离开了。
connect to / with ：与……有联系／连接
The child connected the moon with a fairy tale his grandma told him.
separate：分离 短语：separate…from….
2. Having been separated from other continents for millions of years, Australia has many plants and animals that cannot be found anywhere else in the world.
因为澳大利亚同其他大陆已经分离了几百万年了，所以澳大利亚与许多动植物是世界其他地方找不到的。
