Perhaps the ultimate capital-intensive version is that carried out on factory freezer trawlers, where the catch obtained on the vessel moves through an on-board processing facility, so that frozen product is brought to shore and into the distribution system. A similar level of processing is involved in fish meal production, carried out at large plants. At the other extreme are relatively minimal levels of processing, perhaps carried out by fishers and their families prior to going to market. This may involve a simple process of heading and gutting, or other similarly labour-intensive activities. In between are various levels of processing, carried out at processing plants ranging from community centres to industrial/corporate facilities.
carry out 、level、involve這三個單字，我知道它們的意思，但有沒有比較白話的翻法?