bearings spherical plain » 轴承球面纯 precipitate after boiling water bath » 沉淀后，沸水浴 The flag may be flown at half staff by order of the president,usually to mourn the death of of a public official.
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precipitate after boiling water bath » 沉淀后沸腾水浴 The writer thinks that forgetfulness is a big problem we face as we grow older.
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