There are three dragonflies.

这有三只蜻蜓。

I'd never seen dragonflies.

我从未看到过蜻蜓。

You can saw all those dragonflies.

你可以看到那些蜻蜓。

I like butterflies and dragonflies.

我喜欢蝴蝶和蜻蜓。

This is a website of Asian dragonflies.

这是一个亚洲蜻蜓的网站。