That may be a hint that the action evolved as a social cue - "time for us all to go to bed" - although as usual when evolution and human behaviour meet, the tie is speculative at best.
也许这是打哈欠进化为社交线索的一种暗示——“到我们大家睡觉的时间了”——不过，像往常一样，当进化和人类行为相遇时，推测充其量只是纽带。
Agglomerating behaviour of fine particles and the influence of vibrational parameter on agglomerate size in a type of vibro-fluidized bed are investigated.
本文研究了微细粉体在振动流化床中的团聚行为和振动参数对团聚物尺寸的影响。
The relation of the sticking behaviour of fine iron ore with the separating morphology of metallic iron during reduction in a fluidized bed had been analyzed with scanning electron microscopy.
用电子扫描电镜分析和探讨了铁矿粉在还原流化床中的粘结行为与金属铁析出形态的关系。
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