这名囚犯在一间狭窄的牢房里度过了六个月。
The prisoner spent six months in a cramped ___cell.
癌细胞可以通过放射疗法靶向。
A cancer ___cell can be targeted by radiation therapy.
植物细胞有细胞壁，而动物细胞没有。
The plant ___cell has a cell wall that animal cells lack.
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