哪些源数据项可用，哪些不可用？

Which source data items are available and which are not?

这个程序通过关键词进行搜索，能让你迅速获取数据项。

The program allows you to retrieve items quickly by searching under a keyword.

这是一个定制的数据项，用以为所有活动模组选择级别。

This is a custom element for selecting a grade for any activity module.

需要收集的最重要的数据项是服务器的CPU使用率。

The most important item to collect is CPU utilization on the server.

堆栈是一个后进先出(LIFO)队列，它保存了子例程的返回地址、数据项、指针等等。

The stack is a last-in-first-out (LIFO) queue that holds subroutine return addresses, items of data, Pointers, and so on.