这个用英文怎么说~~

不错，做了少许语句上的修改：

Something beautiful can only be kept in memory.

Some good things seem to only be stored in the memory of .....

是perhaps sth beautiful only can be saved in memory

Some good things seem to only be stored in the memory

These beautiful things could just be left in my memory.
自己译的，不一定好，^_^。

Certain beautiful things perhaps only can be kept in memories.

certain 和 some都是某些，但前者是特指，后者是泛指，前者一定存在，后者不一定。

希望可以帮到楼主~