单词	hem about
释义	hem about vt.围住包围;限制
随便看	standard frequency deviation oscillator standard frequency deviation osillator standard frequency emission standard frequency generator standard-frequency generator standard frequency location standard frequency meter standard-frequency meter standard frequency offset comparison technique standard frequency oscillator standard frequency-satellite service standard frequency service standard-frequency service standard frequency signal standard-frequency signal standard frequency source standard frequency spectrum standard frequency station standard-frequency station standard frequency system standard frequency transition standard frequency transmission standard fresh water standard freuqency station standard fried dough twist