This call, should it succeed, yields the address of the first copy of the function found in a library after the one in which the call occurs.

在一个函数中进行调用之后，如果成功的话，这个调用处理库中找到的该函数的第一个副本。

youdao

Since the MASS vector functions are much faster (by a factor of up to about 30) than a repeated call to a standard library function, the resulting performance improvement can be substantial.

因为MASS向量函数要比对一个标准库函数的重复访问快很多(倍数接近30倍)，所以最后得到的性能改善效果将会是惊人的。

youdao

In terms of the way it is called, there is no difference between a system call and a library function.

就调用方式而言，系统调用与库函数之间没有区别。

youdao