这位学者说：“整个世界都是由物质构成的。”
但是有可能是尼古丁会影响大脑发育或者孕妇在孕期吸烟会影响对胎儿氧气的供应。这位学者说。
It's possible that nicotine could affect brain development, or that access to oxygen during pregnancy might be reduced when the mothers smoke, the researchers said.
通过将气候变化和瓢虫的颜色改变联系起来，这位学者提出了一个“可行的假设，不过现在还不便透漏”他说。
By linking climate change to the shift in ladybug color, the authors present a "workable hypothesis, but it's not quite there yet" he says.
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