伊索寓言：狼 与 鹤

A Wolf had got a bone stuck in his throat and in the GREatest agony ran up and down, beseeching every animal he met to relieve him, at the same time hinting at a very handsome reward to the successful operator. A Crane, moved by his entreaties and promises, ventured her long neck down the Wolf's throat, and drew out the bone. She then modestly for the promised reward. To which the Wolf, grinning and showing his teeth, replied with seeming indignation: "Ungreateful creature! to ask for any other reward than that you have put you head into a wolf's jaws and brought it safe again!"

Those who are charitable only in the hope of a return must not be surprised if in their dealings with evil men, they meet with more jeers than thanks.

词汇：

in the GREat agony 极其痛苦

with seeming indignation 充满怒气

hinting at 暗示