穆兰勉强一笑，露出下颚的牙齿，发出善意的轻笑。接着她又回到现有的话题上。
Mulan gave me a pathetic lower-teeth-revealing smile and grunted a charity chuckle. Then she got back to the topic at hand.
研究者们相信这种下颚的结构和特征与鸟类和非鸟类恐龙均具有联系。
The structure and characteristics of the jaw are associated with birds and not non-avi
科研人员给上颚的左犬齿（比较尖的那颗）或者是下颚的左犬齿注射一个短的电脉冲。
The researchers delivered short electrical pulses to either the upper left canine tooth (the pointy one) or the lower left canine tooth in the subjects.
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