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%。
Dragonflies, butterflies and bees fly in the field. Their bodies can be divided into three parts.
蜻蜓、蝴蝶和蜜蜂在田地里飞。它们的身体能分成三部分。
Dragonflies, butterflies and bees fly in the field. Their bodies can be divided into three parts.
蜻蜓、蝴蝶和蜜蜂在田地里飞。它们的身体能分成三部分。
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