Mom slow-cooked two pork-chops until they were very tender.

pork-chops 是复合名词，由 pork（猪肉）和 chop（切块）组成。pork 指"猪肉"，chop 指"切下的肉块"，通常带骨。pork-chops 合起来指"猪排"，即从猪身上切下的带骨肉块。