Purge air from system prior to placing tank into operation.
膨胀罐在运行之前，要先从系统中排放气体。
The dedicated hang-off line must be inspected prior to operation.
开始作业前，必须检查专用的悬吊绳。
Surgeons must scrub prior to an operation.
外科大夫做手术前必须进行手臂消毒。
Angiography prior to operation was helpful to success.
术前先行患肢动脉造影，有助于手术的成功。
Angiography prior to operation was helpful to success.
术前先行患肢动脉造影，有助于手术的成功。
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