炮台的英文：
battery

pop - up gun emplacements.
自动弹起式炮台

Protective Cannon: Protective Cannon make pirates feel better defended.
防御炮台:防御炮台能让海盗们感到比较安全。

I have visited the battery.
我游览了美国炮台公园

It is the positive of the battery.
这是电池的阳极

The battery is flat.
电池快没电了。

The capacity of the batteries depends on the brand and type of batteries used.
电池容量决定于所用电池的类型和牌号。

The bacteria battery could become as small as a household battery.
微生物电池可以像一般家用电池那么小。

It is mains or battery powered.
它是由电源或者电池供电的。