keepv.保持；保留；继续；贮藏；经营；遵守；供给；照管；饲养；耽搁；保持食物不变质；健康状况如何；保守（秘密@）；记录；遵守；保护n.生计；保存；城堡主楼；监狱；围墙keep at sth不断地做

1. Feeding on pumpkin, the insect had the lowest survival rate and had no fecundity.
   在南瓜上饲养，茄廿八星瓢虫幼虫及蛹存活率低，成虫丧失产卵能力。
2. On a long enough timeline, the survival rate for everyone drops to zero.
   在一个够长的时间线上，每一个人的存活率掉到零。