fire的复数形式fire在什么情况下用单数,什么情况下用复数?请具体说明一下,最好举些例子.

fire:名词.复数是：fires.下面字母U 表示“不可数名词”,C 表示“可数名词”.
1.火[U]
Do you know horses are afraid of fire?
你知道马怕火吗?
2.炉火;篝火[C]
The old men sat round the fire chatting.
老人们围坐在炉火旁聊天.
3.(电或煤气)取暖器[C]
4.射击;炮火;火力[U]
The enemy retreated under our heavy artillery fire.
敌人在我们的重炮轰击下撤退了.
5.火灾[C][U]
In case of fire ring the bell.
万一起火,请按铃.
A forest fire left hundreds of people homeless.
一场森林大火使数百人无家可归.
6.热情;激情[U]
The boy is full of fire and courage.
这男孩充满激情和勇气.
7.磨难;苦难[U]

fires

fires