20-year-old

　　●由20 years old加連字符而成，可用作名詞或形容詞。要注意的是，加上連字符時，中間的years要變成單數。

例如：

　　1.He is 15 years old也可說成He is a 15-year-old.

　　（15-year-old用作名詞，即「15歲的人」）；

　　2.He is a 15-year-old boy.

（15-year-old用作形容詞）。

　　Shake hands (with sb) (idiom)

　　●To clasp and shake the hand of someone as a greeting. （（與某人）握手）

　　Examples:

　　1.His hands were full, and I didn't know whether to shake hands with him or not.　　

　　2.On the way out, the president stopped to shake hands with many in the audience.

　　Embody (verb)

　　●To be the best possible example of a particular idea, quality, or principle, especially a good one.

　　（體現，具體表現）

　　Examples:　　

　　1.The spirit of hope is embodied in the character Anna.　　

　　2.She embodied good sportsmanship on the playing field.

　　Usher sth in (phrasal verb)

　　●To be at the start of a new period, especially when important changes or new things happen, or to cause important changes to start happening.

（開創，迎來）

　　Examples:　　

　　1.These changes could usher in a period of dramatic economic growth.　　

　　2.His inventions helped usher in the era of skyscrapers.

　　Attribute sth to sb/sth (phrasal verb)

　　●To believe that someone or something is the source of something.（把…歸因於…）

　　Examples:　　

　　1.We attribute our success to your good advice.　　

　　2.The doctors have attributed the cause of the illness to an unknown virus.