这有三只蜻蜓。
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。
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