求翻译：在运算过程中，SKEY_REG和MKEY_REG不会被改变，因此在用相同的系统密钥或者消息密钥加解密大量数据的情况下，不需要重复写入密钥；且在系统密钥和消息密钥都没有改变的情况下，不用再启动密钥扩展运算，可以直接启动加解密运算。是什么意思？

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In the computations, The SKEY REG and MKEY REG, will not change, and therefore in the same system as the key, or the key to decrypt a large amount of data, it is not necessary to repeat the key; and in the system key and the message key, there is no change in the situation, and don't have to initiat

In the operation process, SKEY_REG and MKEY_REG cannot change, therefore in uses the same system key or the news key adds the decipher mass datas in the situation, does not need to duplicate reads in the key; Also does not have in the change situation in the system key and the news key, does not nee

In the course of operations, SKEY_REG and MKEY_REG will not be changed, so that the same system key or messaging key and decrypt large amounts of data case, writes do not need to repeat keys and system key and message key used to be the case, no longer starts key expansion operation, you can directl

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