There's solid evidence that there are huge differences in theeffectiveness of teachers.
有确凿的证据表明，教师的工作效率存在巨大差异。
2
He examines different approaches to leadership, the morality of leadership and how the wider context can determine theeffectiveness of a particular leader.
他研究了领导的不同方法，领导的品行，以及更广泛的背景是如何决定了某一个领导者的效力。
3
It is not my intention to point out the central theme of each of the plays in this collection, for that would, indeed, ruin the pleasure of reading, discussing, and thinking about the plays and theeffectiveness of the playwright.