如果这个理论是正确的，那么吸入含有额外二氧化碳的空气应该会引起打哈欠，而吸入纯氧应该可以抑制打哈欠。

If the theory was correct, breathing air with extra carbon dioxide should have triggered yawning, while breathing pure oxygen should have suppressed yawning.

youdao

因为它们的两副翅膀叠在一起，在空气动力学的理论中，这意味着它们对自己身体缺乏控制力。

Because their two sets of wings effectively flap as one, that in theory gives them little control over the aerodynamic forces on their body.

youdao

这个理论认为干燥的空气会使橡木塞变干燥，从而使空气进入酒瓶并破坏葡萄酒。

The theory goes that dry air will dry out the corks, which would let air into the bottle and spoil the wine.

youdao