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（堅果的）仁，核
The kernel of a nut is the part that is inside the shell.
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核心；中心；要點
The kernel of something is the central and most important part of it.
例句
The kernel of that message was that peace must not be a source of advantage or disadvantage for anyone.
那一信息的核心是和平絕不應該成為對任何人有利或不利的根源。
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一小部分
A kernel of something is a small element of it.
例句
For all I know, there may be a kernel of truth in what he says.
據我所知，他的話可能有一點兒道理。