bat（t）=打击（to beat）
词义：n.1.球拍（棒）（to hit or beat）
a baseball bat 棒球球棒
2.蝙蝠
combat=com-+bat（打击 to beat）
词义：n.1.打仗；战斗
（fighting or a fright,especially during a time of war）
He was killed in combat.
他在战争中阵亡。
2.v.战斗；斗争
We combat with them for our rights.
为争取我们的权益，我们跟他们作斗争。
debate=de-+bat（打击 to beat）+e
词义：n.辩论（an argument or discussion）
There had been much debate on the issue of childcare.
人们对儿童保育问题议论纷纷。
v.辩论
（to discuss sth.,especially formally, before making a decision or finding a solution）
The question of the origin of the universe is still hotly debated(=strongly argued about) by scientists.
关于宇宙起源的问题，科学家仍进行着激烈的辩论。
battle=batt（打击 to beat）+-le
词义：n.斗争；战斗
（a fight between armies,ships or planes, especially during a war）
to be killed in battle 阵亡
v.斗争
Both teams battled hard.
两队拼得很厉害。
