前半场比赛(指运动)

первая половина игры; первый половина игры

比赛前选场地

choose sides before a contest

下半场比赛，形势翻过来了。

The situation was reversed during the 2nd half of the game.

比赛到下半场，谁占上风还未见分晓。

In the second half of the game, it was still unclear who was leading.