1 PREFIX （构词成分）表示“不足”，“不够” Under- is used to form words that express the idea that there is not enough of something. For example if people are underfed, they are not getting enough food. （构词成分）表示“不足”，“不够”
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Make sure that you are not underinsured.
要确保投保金额不能过低。
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Victorian cut glass is perhaps the most underpriced area of the antique glass market.
维多利亚时代的雕花玻璃器皿或许是古玩玻璃器皿市场上价值被低估得最严重的一个品种。
2 PREFIX （置于表示工作或职位的名词前）表示“副…”，“次…” Under- is added to the beginning of nouns that refer to a job or rank in order to form nouns that refer to a less important job or rank. （置于表示工作或职位的名词前）表示“副…”，“次…”