Focal point (noun)

　　●The most important, interesting, or attractive part of something, that you concentrate on or pay particular attention to.（關注點，重點）

　　Examples:　　

　　1.The focal point of the exhibition is a painting by Rembrandt.　　

　　2.The focal point for the town's many visitors is the museum.

　　Hold fast (to sth) (idiom)

　　●To remain determined, stalwart, and unyielding, as in one's position or opinion.（堅守，不放棄）

　　Examples:　　

　　1.Though it may be hard, we must hold fast in our pledge to environmental reform.　　

　　2.Bush urged the party to hold fast to its traditions.

　　Under the banner (of sth) (idiom)

　　●Identifying oneself with a particular title, slogan, etc.

（在…的旗幟下，以…的名義）

　　Examples:　　

　　1. We're holding the rally under the banner of equality and tolerance.　　

　　2.All are welcome. They operated under the banner"jobs for local people”.

　　Pin one's hopes/faith on (sb/sth) (idiom)

　　●To put one's hope or trust in someone or something.

（寄望於…）

　　Examples:　　

　　1. She'd pinned her hopes on an early acceptance to the college but it didn't materialise.　　

　　2.He pinned his hopes on being rescued soon.

　　Fall behind (phrasal verb)

●To fail to keep up a pace; to fail to maintain a desired level of performance.（落後，滯後）

　　Examples:　　

1. Despite a strong performance in the beginning, he fell behind in the second half of the race and finished last.　　

　　2.She missed two classes and fell behind in her reading assignments.