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. |