3.But no one has to muster up courage to enter a less pretentious antique shop.

muster up courage to ：鼓起勇气...

4.There is always hope that in its labyrinth of musty, dark, disordered rooms a real rarity will be found amongst the piles of assorted junk that little the floors.

此句为新概念3之经典句型99句之一,建议背诵运用

There is always hope that ......：...总有希望...

We cherish the hope that ......：本句中的cherish意思是"抱有、怀有(希望、想法、感情)"，相当于英语"keep (hope, feelings, love, etc.) in mind deeply and with strongly favorable feelings"，这是cherish的常用意义

Ex

You must cherish the hope that one day you will be amply rewarded.新概念英语官网

5.No one discovers a rarity by chance.

By chance / by accident:偶然地，偶尔地

6.A truly dedicated bargain hunter must have patience, and above all, the ability to recognize the worth of something when he sees it.

dedicated : concentrated

above all : most important of all 最重要的是；承上启下，用来加强语气

The ability to do something ：...的能力