一项新的研究发现，有两个因素在发挥作用：一个是听众对于声音来源的认识，另一个是我们耳道那种令人遗憾的形状。
A new study finds that there are two factors at work: the knowledge of where the sound is coming from and the unfortunate design of our ear canals.
比如，他们有两层外膜，药物要发挥抗菌作用必须首先穿透两个单独的屏障。
For example, they have two outer membranes, so antibiotics have to get through two separate barriers to target them effectively.
这两个主要楼层坐落在发挥结构和功能作用的建筑构件之上，这些构件内容纳了礼堂、装卸区、有顶的自行车和汽车停车场。
These two main floors rest on structural and functional building elements, which contain the auditorium, delivery areas, covered bicycle and car parks.
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