ADJ-GRADED 缺乏的;不足的;供不应求的If something is scarce, there is not enough of it.
Food was scarce and expensive...
食物供不应求，而且价格昂贵。
N-COUNT 组成部分;成分The components of something are the parts that it is made of.
Enriched uranium is a key component of a nuclear weapon...
浓缩铀是核武器的关键组成部分。