重点讲解：
1. appear to do sth.
好像；似乎；看来；
eg. There may appear to be discontinuities between broadcasts.
广播节目中可能会出现断音。
eg. They appear to be able to handle the problem.
他们似乎可以处理这个问题。
2. out of balance
失去平衡；
eg. Excessive minerals can throw the body out of balance.
过多的矿物质也会使机体失去平衡。
eg. When any part is out of balance, a lasting peace cannot be maintained.
当任何一方失去平衡，都不能维持一种持久的平静心境。
3. a clue/clues to
线索；提示；
eg. How a man shaves may be a telling clue to his age.
男人刮胡子的方式也许能泄露其年龄。
eg. Other clues to the men's disappearance are few.
人们几乎找不到线索去寻找这两个失踪的人。