Bifocus
双焦点
🗣️ 情景例句
That'll be fifty-five dollars and twenty cents.
一共55元2角。
Gordon was not upset by his failure.
哥顿对他的失误既不惊讶也不生气。
This depends on the precise radio frequency of the 21-cm wavelength, or 1420 megacycles per second.
这种通讯联系要靠21厘米波段，即每秒1420兆周的精确无线电频率。