We all know that slacking off on dental hygiene is the first way to get cavities, but stress can also be a culprit, say experts, especially when you’re grinding your teeth at night or during the day.
我们都知道对牙齿保健的懈怠是诱发龋齿的第一因素，但专家称压力也可能导致龋齿，尤其是当你晚上或白天磨牙时。
It was in this month something over twenty years ago that I, Ludwing Horace Holly , sat one night in my rooms at Cambridge, grinding away at some mathematical work, I forget what.
也就是在这个月份的一天晚上，我，路德维格·霍勒斯·霍利，正坐在剑桥大学我的房间里埋头攻读数学著作，具体读的是本什么书，我记不大清楚了。
"That crazy rat!" thought Wilbur. "Why does he have to stay up all night, grinding his clashers and destroying people's property?"
“这只疯狂的老鼠，”威尔伯想道：“为什么它整晚都不睡，为什么它要磨着自己的牙齿来毁坏人类的财产？”
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