nugget
/ˈnʌgɪt/noun
1- a small lump of gold or other precious metal found ready-formed in the earth天然金块; 天然贵金属块。
1.1
- a small chunk or lump of another substance（某种东西的）一小块：
a nugget of food.
一小块食物。
1.2
- a valuable idea or fact有价值的想法（或事实）：
nuggets of information.
有价值的信息。
词源
mid 19th cent.: apparently from dialect nug 'lump'， of unknown origin.