at and from meaning in English

在……并自……在和从条款
在…并自…
在此及由此
在和从条款

A registered electrical contractor shall carry on hisher business as an electrical contractor only at and from each business address registered with dems
注册电业承办商只限在已向机电工程署署长注册的各营业地址从事或开展电业承办商业务。
You shall carry on your business as an electrical contractor only at and from each business address registered with the director of electrical and mechanical services
你只限在已向机电工程署署长注册的各营业地址从事或展开电业承办商业务。
You shall carry on your business as an electrical contractor only at and from those business address ( es ) registered with me ( as shown on the registration certificate ( s ) )
你只限在已向本署注册的营业地址（即注册证明书上所载）从事或展开电业承办商业务。