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:系舟吃了一惊，正是因为他的细心冷静，让他立刻觉得一个刚刚30级的玩家拣了十个磨砂石是件多少不可思议的事。把这个考虑进去，稀有材料才会当得起“稀有”两字。
文本:这个可是指定的隐藏BOSS才会掉落的东西，虽然掉落机率蛮高，但稀有材料的稀有本就不在爆率，而是在隐藏BOSS的刷新概率。
翻译:
human
These were materials that only dropped from a specific hidden BOSS. Even though their chances of dropping were high, that wasn’t the reason why they were uncommon, rather it was because of the probability of meeting that specific hidden BOSS.
agent