不能不能 meaning in English

can not

Dr . ian malcolm : yeah , but your scientists were so preoccupied with whether or not they could , they didn ' t stop to think if they should
马尔科姆博士：是的，但是你们科学家总是关注不能不能办到，而不想想该不该这么做。
And robin williams , whose product can always take my heart away , made the image of the warm hearted guide spotless and splendidly alive
而罗宾韦廉姆斯以他一贯出众的演技，赋予了本片中热心而高尚的导师形象跃然纸上，令人久久不能不能忘怀。