长期存在的long-standing
购买期货buy long【金融】;forward buying【金融】
脐带过长long cord
长鸡Long Chicken
孤注一掷a long shot gamble
胡子工程long-drawn-out project (a project which takes so long that young workersbecome bearded)
十三个a long dozen
长分流复励绕组long shunt compound winding【电】