"as we all know" 可以用以下几种表达方式替换:
1. It is well known that
2. We are all aware that
3. It goes without saying that
4. As a matter of fact, it is
5. Generally speaking, it is
6. It is a well-established fact that
7. As is commonly known,
8. It is widely accepted that
9. As we can see,
10. It is a fact that
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