1.remain to 保持
Some evident problems remain to be sorted out.
仍有些突出問題亟待解決。
And the most important questions remain to be answered.
而最重要的問題仍然沒有答案。
2.able to 能;會
He was even able to build his own home.
他現在甚至能建一所自己的房子。
How fortunate that he had been able to love!
能愛別人是多么幸運的一件事!
3.a couple of 兩個,幾個
We met in moscow a couple of weeks ago.
幾周后我們在莫斯科又見了一面。
Within a couple of days, both sons-in-law were killed.
幾天內,兩位女婿都被殺。