It is a luxury in such circumstances to expect individual attention, especially in classes where students in the backrows can hardly see the blackboard.
在这种情况下, 期望个人保持注意力是一种奢侈,尤其是在课堂上后排学生几乎看不见黑板的时候。
2
Thus, all SHIPs in this query execute at the same time until they are ready to deliver rowsback to the federated server.