tumor marker的用法和样例：
例句
- Tritide can be used as a tracer and is an ideal marker of knowing the reservoir and the state of the fluid movement.
氚化物作为示踪剂是一种较理想的认识油层及其流体运动状态的标记物。 - Is Pre-operative Anaemia a Risk Marker for In-hospital Mortality and Morbidity After Valve Replacement?
手术前贫血是瓣膜置换手术后院内死亡率和发病率的危险标记物吗？
