张萍背景：静脉穿刺是临床治疗最常用的方法之一。
BACKGROUND: Venipuncture is one of the most common methods in the clinical treatment.
由于担心时间不够，张萍早就把她想要在伦敦参观的地点列了一个单子。
Worried about the time available, Zhang Ping had made a list of the sites she wanted to see in London.
由于担心时间不够，张萍玉早就把她想在伦敦参观的地点列了一张单子。
Worried about the time available, Zhang Pingyu had made a list of the sites she wanted to see in London.
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