背景与目的乳腺癌是女性最常见的恶性肿瘤之一。
Background and objective Breast cancer is one of the most common malignant tumors in women.
背景与目的：恶性肿瘤是儿童死亡的主要原因之一。
Background and Objective: Cancer is one of the most primary causes of death for children.
指出了本课题提出的背景，研究的目的与意义，研究方法等。
Pointing out the background of the problem, the purpose, the significance and the research method.
论文首先阐述了选题背景与研究的目的和意义。
The paper first elaborates the goal and significance of background and research.
论文首先阐述了选题背景与研究的目的和意义。
The paper first elaborates the goal and significance of background and research.
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