One two ,three dragonflies, they are flying.
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three dragonflies
三个蜻蜓
以上为机器翻译结果，长、整句建议使用 人工翻译 。
There are three dragonflies.
这有三只蜻蜓。
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One two, three dragonflies, they are flying.
二，三只蜻蜓，他们在飞。
Three hundred million years ago, dragonflies and millipedes grew to frankly disturbing sizes - thanks in part to levels of oxygen in the atmosphere as high as 30 per cent.
三亿年前，蜻蜓和蜈蚣长得惊人的巨大，一部分原因是因为空气中的含氧量高达30%。
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