I have been doing community service work in Oakland for the past several years.
过去几年里我一直在奥克兰做社区服务工作。
For the past several years, the medicine industry of China has changed a lot.
近年来，我国的医药产业已经发生了巨大的变化。
For the past several years, the medicine industry of China has changed a lot.
近年来，我国的医药产业已经发生了巨大的变化。
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