2. rare adj. 罕见的, 珍贵的,很少发生的,少见的
例句：It is rare to see a man over 160 years old.
很少见到一个人能活到160岁。
3. nod n. 点头; (点头表示)同意
例句：The judges gave the nod to the winning challenger.
裁判们对挑战者的胜利给予确认。
4. blend v. (使)混合, (使)混杂
例句：Oil and water do not blend.
油不溶于水。
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