The H1N1 pandemic was characterized by the emergence of a new influenza virus to which many people had no pre-existing immunity.
H1N 1流感大流行的特点是出现新的流感病毒，而许多人对其并没有预先存在的免疫力。
The phase and morphology of exhausted catalyst before and after microwave radiation-pre- treatment and leaching are characterized by XRD and SEM techniques.
采用X射线衍射（XRD）和扫描电子显微镜（SEM）对微波辐射预处理前后和浸出前后的物相及废催化剂形貌进行了表征。
The pre-stressed profiled steel concrete beams used in Shen'guang Institution of Education and Research Project are characterized by big span, small cross-section and complicated technology.
深港产学研基地工程采用预应力型钢混凝土梁，具有跨度大、断面小、技术复杂等特点。
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