介词短语
中文翻译：从
同义词：
['from', 'since', 'beginning of']
例句：
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1. As of today, I have completed my homework.
从今天起，我已经完成了我的作业。
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2. Since the new policy was implemented, there has been a significant improvement in the environment.
自从新政策实施以来，环境有了显著的改善。
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3. The company has been operating as of January 1st.
该公司自1月1日起开始运营。