1 a once-in-a- lifetime experience 一生中难忘的一次经历
It was a once-in- a -lifetime experience! I went on a sightseeing safari in an animal park and saw herds of wild animals. and I stayed in a hut in an African village! 那是我一生中难忘的一次经历。 那时我在一个野生动物园观光旅游，看见了大量的野生动物，并住在一个非洲村庄小屋里面。
2 paradise on Earth 人间天堂
What about Maldives? It is known as a paradise on earth.
那么马尔代夫怎么样？那里被称为人间天堂。
3 backpack背着背包徒步旅行(或越野)，背上背包出游
We went backpacking in the Alps.
我们背着背包游览阿尔卑斯山脉。
to backpack through the mountains
背着背包爬山
I backpacked across Africa 我背着双肩包跨越非洲。
4 over the moon 开心极了
On seeing the the Alps,I was over the moon. 一看到阿尔卑斯山，我开心极了。
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