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- Tumor markers are defined as the antigens and biotic activators which are the abnormally expressed products, and those substances are produced by the related gene of the tumorous tissue and cell, not by normal tissue. 肿瘤标志物是指肿瘤组织和细胞的相关基因及其产物异常表达所产生的抗原和生物活性物质，正常组织不产生或产量甚微，但肿瘤患者组织、体液和排泄物中浓度可能较高，而易被检出。
- The office has been humming with activity. 办公室一直忙着搞活动。
- The threat of war has depressed business activity. 战争的威胁使经济萧条。
- There has been a lot of activity in the town today. 今天市中心相当热闹。
- The town was humming with activity. 该市镇生气勃勃，呈现一片热闹的景象。
- Stamp collecting is my favorite activity. 集邮是我最喜爱的消遣。
- The store was a scene of great activity. 这家商店顾客盈门。
- He once engaged in anti-government activity. 他一度从事反政府的活动。
- The office is humming with activity. 办公室里一片忙碌。
- Biotic activity 生物活性
- A center of interest or activity. 中心兴趣或活动的中心
- Showing no optical activity in polarized light. 无旋光的极化光下无光学反应的
- An increase, as in movement or business activity. 进步，改进，改善运动或商业活动的进步或兴隆
- Indulgence in or pursuit of sexual activity. 纵欲; 追求肉欲对性行为的放纵或追求
- The phenomena associated with volcanic activity. 火山现象与火山活动有关的现象
- A range of endeavor or activity; a province. 范围努力做 ... 的范围或活动范围; 范围
- Strict regulations that paralyze economic activity. 阻碍经济活动的严格的规章制度
- One of the most characteristic species in a biotic community. 在生物群落中最有特征的别类之一
- A state of nervous activity; a fuss. 吵闹处于紧张活动状态; 吵闹
- Purposeful or industrious activity; enterprise. 企图，进取心有目的的、勤勉刻苦的行动; 进取心
