It's as though he's explaining,

修昔底德的解释
giving an answer to a question that somebody asked,

回答了许多人的疑问
"why didn't the Spartans do better in that battle?"

"斯巴达人为什么不将剩勇追穷寇呢"
To which there could many answers at the Battle of Mantinea,

曼提尼亚战役可能会给我们很多答案
but it seems there's a much easier answer.

但以下的回答可能是最直接的
Basically, the Greeks couldn't pursue very hotly with infantry.

希腊步兵没有办法紧追敌人
They don't want to throw their shields away,

他们不愿意扔掉自己的盾牌
they want to keep their shields,

要把盾牌留在自己手中
so guys with shields are chasing guys without shields.

这样就变成了带盾士兵追击无盾士兵
So, they're not going to chase them very far.

当然是没办法追得远的
Now, another issue that emerges in discussion of these kinds of battles

此类战争中的另一个问题
is the casualties.

是伤亡人数