重点讲解：
1. as to
关于…；
例句：Local inhabitants haven't the slightest doubt as to who is the rightful owner.
当地居民对谁是合法所有者没有丝毫疑问。
例句：He is in no doubt as to what is needed.
他很确定需要什么。
2. be composed of
组成；构成；
例句：The sea water is mainly composed of water and salt.
海水主要由水和盐组成。
例句：All animals and plants are composed of cells.
一切动植物均由细胞组成。
3. be similar to
相像的；相仿的；类似的；
例句：Mary's symptom is similar to Joseph's in some way.
玛丽的症状在某些方面和约瑟夫的类似。
例句：I came across a sentence similar to this one in structure.
我碰到过在结构上与这个相似的句子。
4. prey on
捕食；
例句：The effect was to disrupt the food chain, starving many animals and those that preyed on them.
后果是打断食物链，使许多动物和捕食它们的动物饿死。
例句：Stronger animals prey on weaker ones.
弱肉强食。
5. protect from
保护；防护；
例句：He raised his arm to protect his child from hurt.
他伸出手去，保护他的孩子免受伤害。
例句：Such laws could protect the consumer from harmful or dangerous remedies.
这样的法规可以保护消费者免受有害或者危险药品的威胁。
