为了验证这一假设，研究人员将处于第四和第五阶段发育期的幼年龙虾放在能够操纵牡蛎片的实验室环境中饲养。
To test this hypothesis, researchers raised lobsters in the juvenile fourth and fifth stages of development in a laboratory environment in which the lobsters could manipulate oyster chips.
此前，第五层被用作餐具储藏室和图书馆，但这一次，建筑师决定把五层完全用于储藏。
Previously, the fifth floor was used as a tableware storage room and library, but this time the architects decided to dedicate that floor exclusively to storage.
费南多先生及其下属的办公室占据了大楼的整个第五层。
The offices occupied by don Fernando and his retinue took up the entire fifth floor of the building.
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