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重点讲解：
1. be unique to
独有的；特有的；
eg. This problem is not unique to Brazil.
并不仅是巴西存在这一问题。
eg. The custom is unique to the region.
这种风俗是这一地区特有的。
2. an eye for an eye
以眼还眼；以牙还牙；一报还一报；
eg. The death penalty for murder works on the principle of an eye for an eye.
犯谋杀罪处以死刑，其原则是一命抵一命。
eg. An eye for an eye, and we will all go blind.
以牙还牙，两败俱伤。
3. more or less
或多或少；大概；几乎；
eg. We decided, more or less on a whim, to sail to Morocco.
我们多少有点心血来潮，决定航海去摩洛哥。
eg. I was more or less pitiful at the news he couldn't come.
听到他不能来的消息后，我多少有些遗憾。
