The moon will protect us forever.
不过这句话有没有什么引申出来的意思，要是有的话就不能这么直译了...祝你好运！
我觉得应该用guard啊...The moon will always guard us.
The moon will defend us forever.
The moon will always watch us.
The moon will always watch over us.
The moon goddess will always be our guardian
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