当射线轰击化石时，反弹回的信号的强度取决于每一个分子的形状和大小，以及它所处的化学环境造成的细微影响。
When the rays hit the fossil, the signal that bounces back depends on the shape and size of each molecule, and how it is being subtly influenced by the chemicals surrounding it.
这些声音在水下行进，直到遇到水下物体，然后返回到发出信号的海豚，显示出目标的位置，大小和形状。
These sounds travel underwater until they encounter objects, then bounce back to their dolphin senders, revealing the location, size, and shape of their target.
这种智能芯片比火柴头还稍小，而现今最好的植入物却仅仅是如火柴盒一样大小，这种芯片通过阻断传向大脑的疼痛信号来发挥作用。
Slightly smaller than the head of a match - the best implants today are only as small as a matchbox - the chip works by blocking pain signals on their way to the brain.
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