de-, 向下，强调。mark, 标记，边界。即画下边界。

1. A special UN commission was formed to demarcate the border.

联合国成立了一个特别委员会来划定边界。

2. Verification or falsification alone is not enough to demarcate science.

单凭证实或证伪都不足以为科学划界.

3. Demarcate port is received, the user needs identity test and verify.

限定端口接入, 用户需身份验证.

4. Additional, manage the demarcate sex of deadline namely.

另外, 就是经营期限的限定性.

5. Transparency will demarcate the value creators and destroyers.

透明将把价值创造者与价值摧毁者区分开来.