Because when they added extra thyroid hormone to zebrafish's tanks, their tiny hearts were no longer able to regenerate.

因为当他们向斑马鱼鱼缸中加入额外的甲状腺激素时，斑马鱼的小心脏便不能再生了。

Other groups are facing down the zebrafish, a relatively tractable vertebrate.

其他小组正在面对斑马鱼，一种相对容易驯服的脊椎动物。

These are zebrafish embryos  each less than one millimeter long.

这些斑马鱼胚胎每个长度都不到一毫米。

But now, scientists have tried to build custom holodecks for fruit flies, zebrafish, and mice.

但现在，科学家们已经尝试为果蝇、斑马鱼和老鼠建造定制的全息甲板。

It’s called FreemoVR, and it’s for mice, zebrafish, and flies.

它叫做 FreemoVR，适用于老鼠、斑马鱼和苍蝇。

Swimming along with them is a robot lure, the same size and shape as a zebrafish.

与它们一起游泳的是机器人诱饵，其大小和形状与斑马鱼相同。

In Switzerland, a small school of zebrafish swim around a circular path, with a camera overhead tracking their position.

在瑞士，一小群斑马鱼绕着圆形路径游动，头顶上的摄像头跟踪它们的位置。

In one line of experiments, researchers analyzed some 92,000 zebrafish cells, and gathered data from 7 different embryo stages.

在一系列实验中，研究人员分析了大约 92,000 个斑马鱼细胞，并收集了来自 7 个不同胚胎阶段的数据。

And zebrafish often swim in groups, so the researchers used a special bowl and projected a bunch of space invaders -- like the video game!

斑马鱼经常成群结队地游泳，所以研究人员使用了一个特殊的碗， 投射出一群太空入侵者——就像电子游戏一样！

In the second experiment, the bees' behavior was observed and then transmitted to the fish robot, affecting which way it lured the school of zebrafish.

在第二个实验中，蜜蜂的行为被观察到，然后被传送到捕鱼机器人，影响它以何种方式引诱斑马鱼群。

To further explore this relationship, researchers used robots to mediate between two species unlikely to ever encounter each other in the wild: zebrafish and honey bees.

为了进一步探索这种关系，研究人员使用机器人在两种不太可能在野外相遇的物种之间进行调解：斑马鱼和蜜蜂。

Thus, they could trace each zebrafish cell's fate through time to see how a single cell gave rise to a variety of specialized cells, such as heart, nerves, and skin.

因此，他们可以通过时间追踪每个斑马鱼细胞的命运，以了解单个细胞如何产生各种特殊细胞，如心脏、神经和皮肤。

But researchers observed some zebrafish cells switched to different new types – as indicated by the change in what genes were active—after they should have been well committed to a certain fate.

但研究人员观察到，一些斑马鱼细胞在本应很好地适应某种命运之后，转变为不同的新类型——正如活跃基因的变化所表明的那样。