英语语法分析

Objective: To study the diagnosis and treatment of retrorectal tumor.

目的：探讨直肠后肿瘤的诊断与治疗。

Objective:To investigate the feasibility of the axial lumbosacral interbody fusion via retrorectal approach in Chinese.

目的：探讨国人直肠后间隙入路轴向行腰骶椎融合术的可行性。