求翻译：一般可通过罐装奶粉上盖的透明胶片观察罐内奶粉，摇动罐体观察，奶粉中若有结块，则证明奶粉已经变质，不能食用。是什么意思？

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General through canned milk atop the observation in a cylinder transparencies milk powder, milk powder, rocking tank observer, if there is a cake, that proves that milk has gone sour, not edible.

May through in the canned powdered milk top head transparent film observation pot the powdered milk, undulate the shell of tank observation generally, in the powdered milk if has agglomerates, then the proof powdered milk already deteriorated, could not edible.

Usually by observation tank cover of transparency on canned milk powder milk, shaking tanks observed in milk powder by agglomeration, is evidence that the milk powder has been deteriorating, to eat.

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