Retrospective study at a single center.
在一所单中心行回顾性研究。
A single massive star visible near the center causes much of the Trifid's glow.
在中央附近可以看到单独的一颗大质量恒星，这也造就了三裂星云部分光芒。
The first section discusses nouns as a single predicate center.
第一节探讨单个名词充当谓语中心语的情况；
Coider a data center where a single server ru a single application.
呆呆的一个数据中心，一个俄文单个应用程序服务器。
LIMITATION: This was a single-center study.
局限：这是一个单中心研究。
The ball went over the pitcher's head and into center field for a single.
球越过投手头顶，飞向中外场造成一垒打。
The ball went over the pitcher's head and into center field for a single.
球越过投手头顶，飞向中外场造成一垒打。
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