本期内容：

Scientists have successfully transplanted a bioengineered lung into a pig. To create a new lung, experts used a "scaffold" that provided structural support and slowly built up the lung tissue around it, using cells from the pig that was due to get the transplant. This was done to prevent the lung being rejected by the pig's immune system.

bioengineer vt. 用生物工程技术制作/创造 n. 生物工程师
scaffold: n. 脚手架
structural: adj. 结构的
tissue: n. 组织
prevent sth. doing: 阻止……
reject: vt. 排异
immune system: 免疫系统

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