fire是可数还是不可数啊？

【专家解说】：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] [U]为不可数[C]为可数