用碗把菜扣上免得凉了: cover the food with a bowl to keit from getting cold. detain
仔细: 1.(细心) careful; attentive 短语和例子仔细听 listen attentively [carefully]; lend an attentive ear to; 观察得很仔细 observe very closely; 仔细研究 study carefully; 做事很仔细 be very careful in whatever one does2.