Maryam Saleh, a Cyberkinetics Inc. clinical research assistant, holds a brain gate sensor, which will be implanted beneath the skull, at the company in Foxboro, Mass., Tuesday, April 13, 2004. Cyberkinetics of Foxboro has received Food and Drug Administration approval to begin a clinical trial in which four-square-millimeter chips will be implanted beneath the skulls of paralyzed patients. If successful, the chips could allow patients to send computer commands, essentially by thinking about them. (AP Photo/Chitose Suzuki)

词汇：

clinical adj.临床的，病房用的

assistant n.助手，助教

implant vt.植入，插入把……牢固地嵌入

skull n.头脑，头骨

approval n.赞成，承认，正式批准

clinical trial 临床试验

paralyze vt.使瘫痪

essentially adv.本质上