1. at one time 曾經；一度
例句：Most of us, at one time or another, have been struck with the thought that we might mistake a dream for reality, or reality for a dream.
我們中的大多數都曾經有過這么一種想法：我們可能將一個夢境誤認為是現實，或者將現實誤認為是夢境16[Cew;mG40p!XX6#Q。

2. key pal 筆友，網友
例句：I have an English- speaking key pal now, and she points out my grammar mistakes.
現在我有了一位英文筆友，她會指出我在文法上所犯的錯誤RWpdi+EuZ(yR;iQ#@,。

3. strike up 建立起（友誼）
例句：The two strike up a unique friendship, even as a string of murders in their small town threaten to tear them apart.
盡管小鎮上發生的一連串謀殺可能讓他們分開，兩人仍然建立起一段特殊的友誼#[LIs]R;J~]U&#gbr3。

4. keep in contact 保持聯系
例句：She says its success is down to the simple action of establishing an "e-group" for journalists, enabling them to keep in contact, discuss issues and exchange articles.
她說它的成功歸功于建立一個記者的“網群”的簡單行動，這讓他們可以保持聯系，討論問題并交換文章[%c;^s-(5_tA1.dr)。