An upgrade path is always provided and compatibility between versions is usually maintained unless explicitly stated otherwise.
升级路径将一直提供。而各版本间的兼容性也会经常维持，除非另有声明。
These specifications apply in whole unless explicitly stated otherwise and may include references to other specifications that also apply.
除非另有明确规定，否则此类规范应全部适用，并可参考其他可能适用的规范。
Every poster in MAC10 (unless explicitly stated) is an original, vintage, theater-used poster. These posters were never commercially available and were only printed in the year of their issue.
所有MAC10的海报(除非有特殊说明)都是原版高质量剧院使用过的海报。这些海报没有被商用过而且只在电影发行一年内印刷。
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