1·This suggests yawns are triggered by an increase in brain temperature and "actually promote brain cooling," Gallup said.
这表明打呵欠是因为大脑温度升高所触发的，且“实际上促进了大脑降温”盖洛普说。
2·But the new study on yawning changes the popular notion that yawns are mere signs of boredom.
但是这项新的关于呵欠的研究改变了大众对呵欠的看法——只不过是无聊的表现。
3·It is because symmetry is ennui, and ennui is at the very foundation of grief. Despair yawns.
再没有比对称的格局更令人感到难受的了，因为对称的形象能使人愁闷，愁闷是悲伤的根源，失望的人爱打呵欠。
4·Scientists also hypothesized that feathered dinosaurs had lice and determined that yawns are contagious among chimpanzees.
科学家还猜测有羽毛的恐龙会生虱子，还认定呵欠在黑猩猩中也是会传染的。
5·His yawns suggested he was either tired or bored.
他呵欠连天说明他不是疲倦，就是厌倦。