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重点讲解：
1. be diagnosed as 诊断；确诊；判断；断定；
The soldiers were diagnosed as having flu.
这些士兵经诊断患了流感。
2. on board 在火车（或轮船、飞机）上；
The cargo on board have been damaged by sea water.
船上的货物因水湿而残损。
3. take up 开始处理；讨论如何处理；
Mr. de Garis's MP, Max Madden, took up the case.
德加里斯先生的下议员马克斯·马登开始着手处理这个问题。
4. at present 目前；现在；眼下；
At present, the airline operates two flights a day to London using Boeing 747 planes.
目前，该公司每天有两架波音747飞往伦敦。
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