hawkern.沿街叫卖的小贩hawker permitted area小贩认可区hawker restricted area限制小贩摆卖区；小贩限制区hawker prohibited area禁止小贩摆卖区；小贩禁区Hawker Control Officer小贩管理主任hawker permitted place小贩认可营业地点hawker licensing system小贩发牌系统Hawker Siddeley Dynamics霍克西德利动力公司hawker registration chit小贩登记纸hawker clearance operation扫荡小贩行动hawker control organization小贩管理组织