机构的特定外形可聚焦超声波，对被扫描的物体产生穿透作用。
Their shape focuses the waves so that they penetrate the object being scanned.
尽管局部用维甲酸类可使角质化皮肤恢复正常，抑制粉刺形成，并能改善其他药物的穿透作用，但他们没有抗菌作用。
Although topical retinoids are effective in normalizing keratinization, preventing comedone formation, and improving penetration of other topical agents, they do not possess antimicrobial properties.
因为中微子几乎不与其它物质相互作用，它们穿透土地流动，之中很小的一部分撞击在探测器上，成为可以观测到的粒子簇。
As the particles hardly interact at all with other matter, they stream right through the ground, with only a very few striking the material in the detector and making a noticeable shower of particles.
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