kernel
noun [ C ] uk/ˈkɜː.nəl/ us/ˈkɝː.nəl/
(PLANT PART)
（坚果可食用的）仁，核
the part of a nut that is inside the shell and can be eaten
（玉米的）颗粒，粒
the whole seed of the maize plant
(IMPORTANT PART)
核心，中心，要点
the most important part of something, although it might not always be easy to find
There is often a kernel of truth in what they say. 他们的话里常常包含些真理。