We went to see him once in a while when he was in Washington.
他在华盛顿的时候我们偶尔去看一看他。
It's pretty painful now. But it will be nothing serious in a while when you look back.
现在非常痛苦，等过阵子回头瞧瞧，会发现其实那都不算事。
We went to see him once in a while when he was in Washington.
他在华盛顿的时候我们偶尔去看看他。
I miss once in a while when I thought that everything could be different.
我偶尔会想念，我以为一切都会不一样的时光。
Her voice trembled as (while, when) she spoke.
她讲话时，声音发颤。
Xiao Yang was singing happily while (when) he was driving home.
小杨开着车回家时，高兴地唱着歌。
Jim hurt his arm while [when, as] he was playing tennis.
吉姆打网球时把手臂扭伤了。
He sang as (while, when) he worked.
他一边干活，一边唱歌。
He entered the room while (when) his mother was praying.
他进屋时他母亲正在祈祷。
While/ When/ As I was sweeping the floor, I found your pen.
我扫地的时候，发现了你的钢笔。
While (When) I was walking in the street, I met my good friend, Linda.
当我在街上走着的时候，我遇见我的好朋友，琳达。
While (When) we were having a meeting, a stranger came in.
我们在开会时，一个陌生人走了进来。
While (When, As) he stood there, he saw two men enter the bar.
他站在那儿时，看见两个男人进了酒吧。
While (When, As) he stood there, he saw two men enter the bar.
他站在那儿时，看见两个男人进了酒吧。
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