The substitution of the equivalent types depends on the compatibility of types, whether they are fully compatible, forward compatible, or backward compatible.

等价的类型可替换程度取决于兼容性，是完全兼容，还是前向兼容，还是后向兼容。

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Budding filmmakers might reasonably prefer to shoot their low-budget masterpieces in a snappy forward-looking format instead of a fuzzy one compatible with a 50-year-old TV.

FORBES: Pixel-Packin' Camcorder