求翻译：吃前一定要洗净，去净鳞、腮及内脏，无鳞鱼可用刀刮去表皮上的污腻部分，因为这些部位往往是海鱼中污染成分的聚集地。是什么意思？

Must wash before eating, to net scale, cheeks and offal, scaleless fish knife scraping skins are available on the dirt greasy parts, because these parts are often gathering place for the pollution components in marine fish.

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Front eats must certainly clean, goes to only the scale, the cheek and the internal organs, the non-scale fish available knife scrapes off on the epidermis the dirt greasy part, because these spots often are in the sea fish pollute the ingredient the accumulation place.

Must wash before eating, to net scale, cheeks and offal, scaleless fish knife scraping skins are available on the dirt greasy parts, because these parts are often gathering place for the pollution components in marine fish.

Must wash before eating, to net scale, cheeks and offal, scaleless fish knife scraping skins are available on the dirt greasy parts, because these parts are often gathering place for the pollution components in marine fish.