那趟旅行是我们两人难以忘怀的经历。
最后,我们照了大量的照片去留念这一难以忘怀的经历。
Finally, we took a plenty of photos to memory this unforgettable experience.
我在美城学校教了两个多月的书,那是我一生都难以忘怀的经历。
I have taught at MCI School for over two months. It has truly been an experience of a lifetime.
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