| 释义 |
下界 xià jiè
基本例句
the world of manlowerboundlower boundunderworldLower World近下凡他在发现黄金的那块土地上立下界标以表明他的所有权。He staked a claim to the land where he'd found the gold.
一个频带的上下界频率之差，单位用赫兹表示。The difference, expressed in Hertz, between the two limiting frequencies of a band. |