回答

・line up in a row
・line up side by side

「橫向排一列」在英文中可以表達為【line up in a row】【line up side by side】。

line up=排列，站隊
side by side=肩並肩，一個挨一個
row= 列
in a row＝成一橫排 ⇔in a vertical row/ behind the other ＝成一縱隊，一個接一個

ex. 請排成一橫排。
Please line them up side by side.

ex.請排成一縱隊。
Please line up one behind the other.

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