在不同安全域之间传输文件，只能是低保密级别安全域的文件向高保密级别安全域传输。
When transferring files between the different security domains, files are required to be only transferred from low security domain to high security domain.
在不同安全域之间传输文件，只能是低保密级别安全域的文件向高保密级别安全域传输。
When transferring files between the different security domains, files are required to be only transferred from low security domain to high security domain.
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