He yawns, not troubling to cover his mouth...他打了个哈欠，都懒得抬抬手遮一下嘴巴。He yawns, not troubling to cover his mouth.他打了个哈欠，都懒得抬抬手遮一下嘴巴。When I attended his lecture, I always tried hard to strangle yawns.我上他的课时, 总是竭力地制止自己打呵欠.His ya...
He yawns, not troubling to cover his mouth.他打了个哈欠，都懒得抬抬手遮一下嘴巴。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.When I attended his lecture, I always tried hard to strangle yawns.我上他的课时, 总是竭力地制止自己打呵欠....