In Carboniferous forests dragonflies grew as big as ravens.

纪的森林里，蜻蜓长到大得像乌鸦。

And dragonfly larvae use their butts like aquatic jetpacks.

蜻蜓幼虫把它们的臀部当成水上喷气背包使用。

And in the case of the dragonfly, that's interception.

就蜻蜓而言，那就是拦截。

Different species of dragonflies can be found near the lake.

靠近潮的地方可以发现各种不同的蜻蜒。

They are the young stage of dragonflies predators that feed on worms and tadpoles.

它们是蜻蜓的幼虫，以蠕虫和蝌蚪为食的掠食者。

The eyes of a dragonfly consists of 20,000 tiny telescopes packed together.

蜻蜓的眼睛由20万微小的单眼排一起构成。

During prehistoric times, two-foot dragonflies did exist, because atmospheric oxygen levels were higher.

史时代，因为大气的氧气含量较高，所以两英尺长的蜻蜓确存。

Some insects, such as dragonflies, are nimble enough to cope with the creeping change.

一些虫，如蜻蜓，足够灵活，可以应对缓慢的变化。

So when dragonflies are hunting, they do more than just fly straight at the prey.

因此，当蜻蜓捕食时，它们所做的不仅仅是直接飞向猎物。

Dragonflies were the size of hawks, while some spiders were the size of small birds.

蜻蜓的体型和鹰一样大，有些蜘蛛的体型堪比鸟类。

These are ongoing experiments in which we put living dragonflies in virtual reality.

这些是正进行的验，我们将活体蜻蜓放虚拟现。

Luckily, dragonflies are territorial insects, which always come back on their favorite perch.

幸运的是，蜻蜓有自己的领地总是回到自己最喜欢的栖处。

The volunteers used dip nets to collect dragonfly larvae from their aquatic abodes.

志愿者们使用水采集网从它们生活的水上栖息地收集蜻蜓幼虫。

But freshwater insects, such as dragonflies and mosquitoes, have been growing in number over the years.

但是淡水虫，如蜻蜓和蚊子，其数量过去的几年里一直增长。

Dragonflies and swallows and nighthawks seine the air where the minute winged creatures flit out their minute life spans.

蜻蜓、燕子和夜鹰天空像围网似地捕食，而极小的有翼动物空轻快地飞来飞去，顷刻间其想暂的生命便结束了。

Dragonflies are the most highly perfected flying machine you can see on this planet.

蜻蜓是整个地球上最完美的飞行机器。

That's right, Don. Yael, that's nonsense. Making a prediction would involve trigonometry. Dragonflies don't know trigonometry.

没错啊，老唐。 瑶瑶，这就胡扯了。做出预判需要三角学的知识，蜻蜓可不懂什么三角学。

In the model, dragonflies do coordinate transformations in only one computational step, one layer of neurons.

该模型，蜻蜓只用一个计算步骤，即一个神经元层来做坐标转换。

This is what my movements probably look like to the dragonfly, giving him lots of time to escape.

我的动作蜻蜓看来很可能就是这样的它逃走的时间很充分。

Dragonflies have pretty much the best compound eyes out there with around 30,000 of those little units per eye.

蜻蜓拥有最好的复眼，每只眼睛大约有 30000 个这样的小单位。