The human time system and its significance in TCM have been expounded through reviewing TCM development history, analyzing TCM theory basis and predicting future TCM trend.

从历史反思、理论基础和发展趋向三个方面阐述人体时间系统在中医学上的意义。

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The operating system can allow execution of multiple programs so quickly that it is virtually unnoticeable to a human user, making it seem as all the programs are running at the same time.

操作系统可以快速执行和响应程序，对计算机用户来说，这个执行过程难以被注意到的(因为太快了)。这也让我们觉得，操作系统好像同时执行了多道程序。

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At the time, he had thought he might make synthetic dyes with them. But he had always suspected they might interact with the central nervous system of human beings.

早在克拉科夫大学读书期间，他就着手研究这种物质，当时曾认为或许可以用它们来合成染料，伹也一直猜想它们可能会与人类中枢神经系统发生作用。

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He told students it was time for them to learn what it means to be a human being on Earth at a time when every living system was failing.

VOA: special.2009.06.05

The company also ensures that phone calls are not answered by a system, but by a real human being every time.

FORBES: Don't Poke the Customer: Why Companies Need to Empower Employees and Get Connected

But it's difficult to envision deploying tens of millions of health workers for a single disease each time, especially since the Indian health system faces crippling health human resource shortages.

BBC: India's battle to finish off polio

"It is time for America to take the next steps... and extend a human presence across our Solar System, " he said.

BBC: NEWS | Science/Nature | Bush unveils Moon and Mars plans