messages.content: 请把下面的中文句子翻译成英文
messages.role: system
messages.content: 目的：调查先天性心脏病患儿术前营养状况，分析相关的影响因素。
messages.role: user
messages.content: To investigate the preoperational nutritional condition for the children with congenital heart disease, and to analyze the relevant factors.
messages.role: assistant