本文介绍了两种重要的兼容性概念：向前兼容和向后兼容。向前兼容意味着旧版本的产品能够支持和处理新标准的内容；而向后兼容则指新产品能兼容并使用旧版本的标准或格式。
- “向前兼容”——Forward compatibility
A standard supports forward compatibility if older product versions can receive, read, view, play or execute the new standard.
- “向后兼容”——Backward compatibility
If products designed for the new standard can receive, read, view or play older standards or formats, then the product is said to be backward-compatible.
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