Thus, gum infections seem to add to the inflammatory burden on individuals, increasing cardiovascular risk, the researchers say.

因此，牙龈感染似乎增加了个体的炎性负荷，增加了心血管疾病的发生危险。

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Thus we meet 21-year-old John Curtis who produced the first commercial chewing gum in his home kitchen in Maine in 1848.

由此，我们认识了21岁的约翰·柯蒂斯。1848年，在缅因州家的厨房里，柯蒂斯制作了第一块具有商业性的口香糖。

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Some research suggests that mothers with serious gum infections, or periodontitis, are more likely to give birth to premature, and thus more sickly, kids.

一些科学家们说牙龈感染或牙周炎的孕妇更可能早产。

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