雙輸入雙輸出

The children went in two by two. 孩子們兩個兩個地進(jìn)去。

The children came in two by two (= in groups of two). 孩子們一對一對地走了進(jìn)來。

Lakka-trees ripen two by two And mandarin-ducks die side by side. 梧桐相待老, 鴛鴦會雙死;

They were seaed two by two, with six-foot-tall dividers betwe the cubicles. 2個人坐一排，每個格子用6英尺高的辦公墻分開。

Middle age is the period in life when your children leave you one by one,only to return two by two. 中年是孩子們一個一個離開你、而終歸一雙雙回來的時期。