These maybe totally innocent attempts at connecting from a local machine within your network or a brute force attempt from an unknown host.

这些可能是来自您的网络中本地机器的完全无恶意的连接尝试，也可能是来自未知主机的强力连接尝试。

youdao

New research identifies a previously unknown enzymatic mechanism that subverts the early host immune response and promotes pathogenicity by manipulating a common signaling pathway in host cells.

新的研究发现了一种通过操纵宿主细胞内的一种常见信号通路来破坏早期宿主免疫反应并提高致病性的以前未知的酶反应机制。

youdao

Expermental results show that the system model can not only protect the network and host from existing attacks, can detect unknown attacks, achieved the expected results.

实验结果表明，该系统模型不仅可以保护网络和主机不受已有攻击的威胁，还可以检测出未知的攻击，达到了预期效果。

youdao

We now know that the hot-springs that sustain these "vent" ecosystems occur in every ocean basin and are host to hundreds of previously unknown animal species.

CNN: Probing the ocean's undiscovered depths

The purpose, as Newman points out is to discover the unknown: a Trojan, or bot that has evaded detection and is sitting on some infected host.

FORBES: Uncovering the unknown threat via beaconing detection