当大量带电原子或离子出入神经元时，会产生微小的跨膜电势，同时神经元放电。
Neurons fire when electrically charged atoms – ions – flood in and out of them, creating a tiny electric potential across their membranes.
不久之后，杨说，我们的车椅枕里也会嵌入神念的芯片，来读取大脑的信号，当你累了的时候提醒你，这太智能化了。
Some time soon, Yang says, your car-seat's headrest will have a chip embedded that reads brain signals to know when you're tired. Smart.
除非肿瘤已压迫或侵入神经，通常并不会造成疼痛。良性和恶性肿瘤皆会压迫邻近组织，阻塞血管或增生激素，以上症状都可能致死。
Tumours may not cause pain until they press on or invade nerves. both benign and malignant tumours can press on nearby structures block vessels or produce excess hormones all of which can cause death.
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