You can include additional services as needed, but you gain no additional information by including more than three or four.

可以根据需要包括其他服务，但包括超过三个或四个服务并不会得到更多的信息。

youdao

This means that you can verify the source of the information by using the MAC address of the sender (and the recipient, if necessary), providing an additional level of security.

这意味着您可以通过发送者（和接收者，如果必要的话）的 MAC 地址来验证信息的来源，额外提供了一级安全性。

youdao

You can improve it by adding the -l option to also track location information for the source document, though that data isn't always available and using -l does consume additional memory.

您可以通过添加- l选项来改善这一点，添加- l选项还可以跟踪源文档的位置信息，但是该数据并非始终都可用，并且使用- l选项确实会消耗额外的内存。

youdao

This is an additional layer of market information...markets are driven by greed and fear, so if you can understand fear and quantify it in real-time, you could use that to protect yourself.

ENGADGET