open fire
v. 开火；开始
同义词
参考例子
1.Chestnuts roasting on an open fire, Jack Frost nipping at your nose.
栗子在跳跃的火焰上烘烤，严寒冻住你的鼻子。
2.I can eat pork liver cooked over the open fire minutes after it comes steaming from the hog.
我能吃从刚宰杀的猪体内切下来、还冒着热气、而后在明火上烧熟的猪肝。
3.The helicopters will be used to spy on suspicious vessels and will open fire when necessary to stop any piracy.
舰队将派直升机侦查并跟踪可疑船只，阻止海盗的抢劫行为，一旦遇袭将坚决自卫。
英文解释
v.
1.start firing a weapon
网络释义
open fire
开火; 明火; 开火，对任何射程内的敌人开火; 开炮;
open learning fire service program
开放型消防服务学习大纲;
open circuit fire alarm system
开路火灾报警系统;
over an open fire
在明火上; 野饮;
an open fire
明火, 活火; 一开放火图片; 明火（多指户外，壁炉，火盆烧的火）; 明火;