重点讲解：
1. at last
终于；最后；到底；
eg. He showed his sinister motive at last.
他终于露出了他那邪恶的用心。
eg. Your efforts will not come to no avail, if you can achieve something at last.
如果最后你能够有所成就，你的努力就不会白费。
2. beyond the reach of
够不着，达不到，超出…的范围；
eg. It's beyond the reach of human aid.
那是人力所不及的。
eg. His thought is beyond the reach of my imagination.
他的思想不是我所能想像得到的。
3. on the way
在途中；
eg. I had a puncture on the way and arrived late.
我在路上扎破了轮胎，所以迟到了。
eg. I got caught in the deluge on the way home.
我在回家的路上遇到倾盆大雨。