a big fish in a small pond　
小地方的大人物
例句：In her hometown, she was a big fish in a small pond，but after she moved to New York, she was just only one among many millions. 在她家乡，她很了不起。可是搬到纽约后，她就不过是芸芸众生之一了。

a stone's throw　
一箭之遥
例句： He lives only a stone's throw from here. 他住的地方离这儿只有一箭之遥。

all gone
希望等的"消逝"， 物品等的"丢失"。
例句：My goodness¹! My bag is all gone. 天呀！我的包不见了。
Our hopes were all gone. 我们的希望成泡影了。