你是一名专业的网络小说翻译专家,请将下列网络小说文本翻译成英文.在这个任务中,你将看到一段来自中文网络小说的句子,需要特别注意句子的动词时态和语态.你的任务是根据上下文，将这段句子翻译成英文,确保保留中文文本的原意,同时正确使用动词时态和虚拟语气.
上下文:至于召唤……苦啊！无论跑到哪个角落，正释放读条时就会有一颗子弹飞至打断他的技能。
文本:召唤师是需要召唤各种宠物来帮助自己战斗的，全是释放技能，开战这么久，刚开始提前召唤好的宠物壮烈以后，就再没有补上过。
翻译:
human
Summoners had to summon their pets to help fight. However, summoning had a casting time. The battle had gone on for so long and their previously summoned pets had been killed long ago without ever recovering.
agent