As in other cases during the past few years, average travelers are now the ones paying the price by spending even more time in international airport terminals and undergoing increased screening, while security officials attempt to figure out just went wrong and who was responsible.

VOA: standard.2009.12.28

another thing that you'd find if you looked inside the axon terminals of any of these pre-synaptic membranes, you'd find lots of vesicles or some membrane bound compartments that contain special chemicals called neurotransmitters.

如果你仔细观察,突触前膜的轴突末梢内部,你会发现很多小泡,即膜包被的结构,包含有称为神经递质的特殊化合物

耶鲁公开课 - 生物医学工程探索课程节选