那位总统由于嗓子疼拒绝亲自发表演讲。
The president declined to deliver the speech himself, on account of a sore throat.
我们已经把中央供热系统由燃油改成了燃气。
升旗的系统由湖北省中国航天三江集团的工程师设计和生产。
The system to raise the flag was designed and produced by engineers at China Space Sanjiang Group in Hubei Province.
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