所有的职业理疗师都要求持有营业执照或注册过。
All occupational therapists are required to be licensed or registered.
很多专业人士，比如建筑承包人和地产中介，必须在他们工作的地方持有营业执照。
Many professionals, such as contractors and real estate agents, need to be licensed in the states in which they work.
2006年有2700家持有营业执照的公司，还有无数的小商家，但是要爬上行业顶峰却并不是那么容易。
In 2006 there were 2, 700 licensed manufacturers, and countless additional smaller shops. Rising to the top of the heap is not easy.
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