markdirs : Place a forward slash (/) on the end of all directories that are from a file name substitution.
markdirs：在来自文件名替换的所有目录的末尾添加一个正斜杠 (/)。
2
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。
3
In dealing with images that have too strong a cultural color, the author puts forward three approaches: omission, annotation and substitution.