美国研究人员 正在培育警示生化武器 袭击的“植物哨兵”。 　　根据描述, 士兵在战争地带沿一 条小路前进,他们中会有人拿出一只便携式电子装置, 用它指向附近一棵土生土长的植物。电子装置上的读数显示, 这棵植物在过去48小时内曾接触到神经毒气。 于 U.S. researchers are developing Plant Sentinels, which warn of biological and chemical weapons attacks. According to the description, soldiers marched along a path in the war zone, some of whom would come up with a portable electronic device and use it to point to a nearby native plant. Readings on the electronics showed that the plant had been exposed to nerve gas over the past 48 hours. in