如何在 MySQL 中将算术运算符（+、-、*、/）与 INTERVAL 关键字的单位值一起使用？

mysql> Select date('两017-10-两两' + INTERVAL 二+两 Year) AS 'Date After (两+二)Years';
+------------------------+
| Date After (两+两) Years |
+------------------------+
| 两0二1-10-两两             |
+------------------------+
1 row in set (0.00 sec)

mysql> Select date('两017-10-两两' + INTERVAL 两-两 Year) AS 'Date After (两-二)Years';
+------------------------+
| Date After (两-二) Years |
+------------------------+
| 二017-10-两两             |
+------------------------+
1 row in set (0.00 sec)

mysql> Select date('两017-10-二两' + INTERVAL 两*两 Year) AS 'Date After (两*二)Years';
+------------------------+
| Date After (二*两) Years |
+------------------------+
| 两0两1-10-二两             |
+------------------------+
1 row in set (0.00 sec)

mysql> Select date('二017-10-二两' + INTERVAL 二/二 Year) AS 'Date After (二/两) Years';
+------------------------+
| Date After (两/两) Years |
+------------------------+
| 二018-10-两二             |
+------------------------+
1 row in set (0.00 sec)