He believes that as far back as 30,000 B.C., hunters may have used a system of notation, engraved on bone and stone, to mark phases of the Moon.

他认为，远在公元前30,000年以前，猎人可能会用一套刻在骨头和石头上的符号系统来标记月相。

youdao

When the VCS process (HAD) is killed, other systems in the cluster mark all service groups capable of going online on the rebooted system as autodisabled.

当VCS的进程（HAD）被杀死，其他集群中的系统通过将所有重启系统中的服务组标记为持续联线来实现自动禁用。

youdao

Then, use a simple system of symbols to mark off 4 different information types in the column space left in the margin.

然后，在你的第一列空栏中使用不同4符号为4不同的信息类型做标记。

youdao

Nor should this war mark the beginning of the end of the multilateral system that has been evolving since the end of World War II.

FORBES: Current Events

That was the path taken in the early 1970s, when the D-mark rose after the collapse of the Bretton Woods system of fixed exchange rates.

ECONOMIST: Rebalancing the world economy: Germany

"I can't describe how frustrating that is in terms of the system of marriage being abused, the system of our immigration laws being abused, " said Mark Rimmer, Superintendent Registrar for Brent.

BBC: News - Panorama - Inside a big fat sham wedding