英语语法分析

Gastrostomy is necessary to maintain adequate nutritional status but mothers need training in feeding techniques.

有必要实施胃造口术，从而维持足够的营养，但是需要对母亲提供喂食技巧培训。

Objective: to evaluate the method and clinical application of percutaneous endoscopic gastrostomy after neurosurgery operation.

目的：探讨经皮内镜下胃造瘘术方法及其在神经外科术后的临床应用。

Objective to evaluate percutaneous endoscopic gastrostomy (PEG) for long-term enteral nutrition in patients with cancers of head and neck.

目的研究经皮内镜下胃造口术(PEG)在头颈部恶性肿瘤患者中的临床应用价值。