成对 twinning; pairing: (把 ...)配成一对 pair up ...; 与另一只不成对的鞋子 a shoe that doesn't pair up with the other; 会餐后, 男女青年们成对成对地去跳舞。 after dinner the boys and girls paired off and went to the dance
The db2 optimizer renders expert opinions on data retrieval methods based on the situational data housed in db2 s system catalog and a query input in sql format Db2优化器会根据存储在db2系统目录中的情境数据和sql格式的查询输入来生成对数据检索方法的专家意见。