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INTERMEDIATE LEVEL
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时效 [shi2 xiao4]
☊
effectiveness for a given period of time ☊
AlterAlterung (S)Altern
☊
时效 [shi2 xiao4] ☊ 
effectiveness for a given period of time ☊ 
AlterAlterung (S)Altern ☊ 时效 [shi2 xiao4] ☊ effectiveness for a given period of time ☊ AlterAlterung (S)Altern ☊