有机食品是未使用人工化学制剂和杀虫剂的纯净食品。Organic food is unadulterated food produced without artificial chemicals or pesticides.根据欧盟的一项新指令，杀虫剂的标签标注将更加明确。Thanks to a new EU directive, insecticide labelling will be more specific.大约70%的可可树林...
以多孔材料作成的湿度计既不准确,响应又慢.Hygrometers based on porous materials are neither accurate nor quick response.湿度计: 量度大气湿度的仪器.Hygrometer: An instrument for the measurement of the humidity of the atmosphere.这一性质被用于人们所熟知的自记湿度计中.This p...