两支部队在主要战役开始前，一直在边境地区进行小规模交火。

The two units were ___skirmishing along the border area before the major battle commenced.

这两个足球队在训练中不断进行小规模对抗赛。

The two soccer teams kept ___skirmishing during practice matches.

孩子们在院子里嬉戏打闹，互相追逐着玩耍。

The kids were ___skirmishing in the yard, chasing each other playfully.