【Day 34】长难句1

Time was when biologists somewhat overworked the evidence that these creatures preserve the health of game by killing the physically weak, or that they prey only on "worthless" species.
（Part C. 2010. 英一）

overwork / ˌəuvəˈwə:k / v.(使)过度劳累，过分努力；过度使用
preserve / priˈzə:v / v.保护；维护；保留
game / ɡeim / n.猎物；野禽；野味
prey on 捕食

翻译
曾经有段时间，生物学家或多或少滥用了一种证据，即这些生物通过杀死体弱者来维持种群的健康，或者说它们仅仅捕食“没有价值”的物种。