They started by getting this to work on the gas vesicles alone.

他们开始研究，让气泡囊单独经历这一过程。

Their lab had already been doing a lot of work with programming cells to create tiny structures called gas vesicles.

他们的实验室已经对编辑细胞做了大量研究，来制造“气泡囊”这种微型结构。

Dr. Shapiro and his team had previously been able to put the genes for making gas vesicles into mammalian cells or other bacteria.

此前，Shapiro 博士和他的团队能够将负责制造气泡囊的基因，放进哺乳动物细胞内或其它细菌内。

They pulled a bunch of gas vesicles out of cells (an easy procedure because they just float to the top) and hit them with ultrasound.

他们从细胞中抽取一些气泡囊（该过程很简单，因为它们就浮在最上面）并用超声撞击它们。

So they tried the same experiments again, but this time they used bacteria that were engineered not only to make gas vesicles but also to home in on tumors.

因此他们再次做了相同实验，但这次他们用的基因改造细菌不仅能产生气泡囊，还能瞄准肿瘤。