The happiest thing is beside you wake up every day, a lifetime unchanged.
最幸福的事莫过于每天在你身边苏醒，一辈子不变。
It was a system which has remained basically unchanged.
这套体系在本质上一直没有改变。
The + operator creates a new list and leaves the original list unchanged.
加号+运算符创建了新的列表，并不修改源列表。
It is a pity that he remains unchanged.
他仍然没有改变真是可惜。
It is a pity that he remains unchanged.
他仍然没有改变真是可惜。
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