美国宇航局研究中心正在研制一台“沙拉机”。该机可在太空中栽培莴苣、胡萝卜、洋葱、小萝卜、蕃茄、汤菜、黄瓜和胡椒之类蔬菜,使太空人有新鲜凉拌菜吃。正在试验的首台可操作的“沙拉机”模型,其生产量,可供四名太空人每人每星期制作三份沙拉。美国宇航局的目标,是利用这种“沙拉机”生产各种各样的新鲜沙拉蔬 NASA Research Center is developing a “salad machine.” The aircraft can grow lettuce, carrots, onions, radishes, tomatoes, soup, cucumbers and peppers in space to make astronauts have fresh salad. The first operational “salad machine” model under test, with its production capacity, allows four astronauts to make three servings of salad per week per person. NASA’s goal is to use this “salad machine” to produce a variety of fresh salad vegetables