术前指导用英语可以翻译为 "preoperative instruction" 或者 "pre-operative instruction"。
术前指导是指在手术前向患者提供的关于手术的信息和指导，包括术前准备、手术过程和术后护理的指导。这些信息可以帮助患者准备好进行手术，并在手术过程中和术后做出正确的决策。
一些术前指导的英文例句及其中文翻译如下：
"Please make sure to follow the preoperative instructions provided by your nurse."（请确保遵循您护士提供的术前指导。）
"The preoperative instruction sheet includes information about what to do before the surgery, as well as what to expect during and after the procedure."（术前指导表中包括手术前应该做什么，以及手术过程中和术后应该期望什么的信息。）
"It is important to carefully read and follow the preoperative instructions to ensure a smooth and successful surgery."（仔细阅读并遵循术前指导很重要，以确保手术顺利成功。）