to call upon

基本解释

From here, you can see there are four processors to call upon.
在此示例中，您可以看到有四个处理器可供调用。
Now this'd be fine, if journalists were willing or able to call upon expert sources to verify claims, and then to quote their responses.
如果记者愿意或者能够找到有效的（资料）来源来验证他们的观点并且声明为此负责的话那将再好不过。
It is the responsibility of every educational institution to call upon the youth to learn one thing about success: success always results from hard work. （237 words）
每个教育机构的责任是号召年轻人学会成功之道：成功总是来自于刻苦努力。

It even has the right to call upon other countries to help it with the technology.
FORBES: Stuxnet and the Iranian Nuclear Program
Fortunately for George Carman, Mr Al Fayed's formidable defence counsel, there were other witnesses to call upon.
ECONOMIST: Al Fayed’s Pyrrhic victory The