This program, started in 2005, used to be taught by human teachers.

这个项目始于2005年，曾经由真人教师授课。

youdao

youdao

youdao

It may look like a natural environment of lakes and woodlands, but it was entirely built by human labor.

VOA: special.2009.10.30

He is not his equal by nature and cannot be made so by human laws or human institutions.

他们天生就不平等,更不能通过世俗的法律与制度获取平等

耶鲁公开课 - 美国内战与重建课程节选

Only the operating system has controlling of byte zero NULL in the computer's RAM and so if a function ever returns null, aka zero, well, something must have gone wrong because that can't possibly belong to me that memory because by human convention zero is owned by the operating system; not by a program I wrote.

只用操作系统在内存中能够控制,字节0，并且如果一个函数返回，或者说0，好的，可能出错了,因为那可能是不属于我的内存,因为惯例上，0是由操作系统拥有的,而不是由我的程序拥有的。

哈佛公开课 - 计算机科学课程节选

Those voluptuous curves are stupidly strong: 'undentable by human force' apparently, but also incredibly light.

BBC: Trick of the light: A California road trip

And you can see where the delicate lichens have been disturbed by human feet.

BBC: Skeletal memories in Namibia

And scientists say that some of that rise is undoubtedly being driven by human activities.

BBC: Science & Environment