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有关while 用法while two defectives were keeping guard at the doo

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有关while 用法
while two defectives were keeping guard at the door ,two others opened the pacel.
这里的WHILE可不可以换成WHEN.
有关while 用法while two defectives were keeping guard at the doo
while多跟时间段,加 连续动词例如句中的keep guard ,也可以表转折,有然而的意思.
when多加 时间点,后跟短暂动词,如he was in the car when i saw him .中的see.但也可接连续动词
while大多不能替换 when ,但when 大多可替换while,
你给的句子中,WHILE换成WHEN.语法上没问题,意思改变也小.可以替换