求翻译：下载维护密钥（Download Master Key - DMK）是通过其他方式在安装终端时注入终端安全模块的。该密钥不能在线更新。对于 TMS 系统，此密钥也应保存在加密机或其他安全设备中是什么意思？

Download the maintenance key (Download Master Key - DMK) is installed by other means into the terminal when the terminal security modules. The key can not be updated online. For the TMS system, this key should be stored in encrypted drive or other security devices

Download the key (Download Master Key - DMK through other means) is injected into the installation of terminal when the terminal security module. The key cannot be updated on-line. With regard to this key TMS system should also be kept in an encrypted machine or other security device

The downloading maintenance key (Download Master Key - DMK) is when installs the terminal pours into the terminal security module through other ways.This key cannot the online renewal.Regarding the TMS system, this key also should preserve in the encryption equipment or other safety equipment

Download maintenance key (Download Master Key-DMK) is by installing the terminal into the terminal when a security module in other ways. The key cannot be updated online. For TMS system, this key should be saved in the encryption or other security devices

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