once every 5 days
每5天一次
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Chemical cleaning of the membrane with caustic solution was required approximately once every 5 days.
苛性碱溶液的膜化学清除法要求约每五天做一次。
youdao
Baby do not necessary pass bowel every day. Can be once in 4-5 days.
婴儿未必一定需要每天便便，可以是4 - 5天才一次。
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