billisecond; millimicrosecond; nanosecond (ns)◇毫微秒计时器 chronotron次毫微秒: subnanosecond飞秒,毫微微秒: fs femto second毫微秒, 纳秒: ns毫微秒,10: nanosecond毫微秒电路: nanosecoad circuit下载手机词典可随时随地查词查翻译