[doc] translate explode json array double

i18n/zh-CN/docusaurus-plugin-content-docs/version-2.1/sql-manual/sql-functions/table-functions/explode-json-array-double.md

@@ -24,11 +24,11 @@ specific language governing permissions and limitations
 under the License.
 -->
 
-## Description
+## 描述
 
-The table function is used in conjunction with Lateral View and can support multiple Lateral Views. It only supports the new optimizer.
+表函数，需配合 Lateral View使用，并且支持多个Lateral View。它仅支持新的优化器。
 
-It expands an array column into multiple rows and adds a column indicating the position, returning a struct type. When the array is NULL or empty, posexplode_outer returns NULL. Both posexplode and posexplode_outer will return NULL elements within the array.
+该函数将数组列展开为多行，并添加一个表示位置的列，返回一个结构体类型。当数组为NULL或空时，posexplode_outer会返回 NULL。posexplode和posexplode_outer均会返回数组中的NULL元素。
 
 ## Syntax
 ```sql