一望无际的云幕蒙住了从天顶到地乎线的整个夜空。
It is an improvement with comparison to the unvaried transistor voltage regulators.这比起模拟调压器只能以固定参数进行电压调节,无疑是一个进步。
Monotone refers to a sound, for example speech or music, that has a single unvaried tone.指声音的单调,例如演讲或音乐,只有单一音调。