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重点讲解：
1. at the center of 中心；核心；
At the center of this system is your heart.
这个系统的中心是心脏。
2. be diagnosed with 诊断；确诊；
Last year, she was diagnosed with lung cancer.
去年她被诊断出患了肺癌。
3. pass away 去世；逝世；谢世；
His father passed away a long time ago.
他父亲早就故去了。
4. do one's utmost to do sth. 极度；极限；最大可能；
Now that you put your hand to the work, you should do your utmost to finish it.
既然你已经着手这项工作了，那就应该尽力完成它。
n. 增加，附加物，加法
