update data model (#2544)

* update data model

* update

* Update 2.data-model.md

* Update 2.data-model.md

* Update 2.data-model.md

docs-2.0-en/1.introduction/2.data-model.md

@@ -49,10 +49,10 @@ The following table is an example of the structure of the basketball player data
 
 | Element  | Name  | Property name (Data type)  |  Description  |
 | :---  | :---  | :---  | :---  |
-| Tag  | **player**  | name (string) <br>age (int) | Represents players in the team.   |
-| Tag  | **team** | name (string)  | Represents the teams. |
-| Edge type | **serve**  | start_year (int) <br> end_year (int) |  Represents actions taken by players in the team.<br>An action links a player with a team, and the direction is from a player to a team. |
-| Edge type | **follow**  | degree (int) | Represents actions taken by players in the team.<br>An action links a player with another player, and the direction is from one player to the other player. |
+| Tag  | **player**  | name (string) </br>age (int) | Represents players in the team. </br>The properties `name` and `age` indicate the name and age.   |
+| Tag  | **team** | name (string)  | Represents the teams. </br>The property `name` indicates the team name. |
+| Edge type | **serve**  | start_year (int) </br> end_year (int) |  Represents the action of a player serving a team. The action links the player to the team, and the direction is from the player to the team.</br>The properties `start_year` and `end_year` indicate the start year and end year of the service respectively.|
+| Edge type | **follow**  | degree (int) | Represents the action of a player following another player on Twitter. The action links one player to the other player, and the direction is from one player to the other player.</br>The property `degree` indicates the rating on how well the follower liked the followee. |
 
 !!! note
 

docs-2.0-zh/1.introduction/2.data-model.md

@@ -61,10 +61,10 @@
 
 | 类型 | 名称 | 属性名（数据类型） | 说明 |
 | :--- | :--- | :---| :--- |
-|Tag|  **player**      | name (string) <br>age（int）  | 表示球员。  |
-|Tag|   **team** |  name (string) |  表示球队。 |
-|Edge type|  **serve**  |  start_year (int) <br> end_year (int) | 表示球员的行为。<br>该行为将球员和球队联系起来，方向是从球员到球队。  |
-|Edge type|  **follow**  | degree (int)  | 表示球员的行为。<br>该行为将两个球员联系起来，方向是从一个球员到另一个球员。  |
+|Tag|  **player**      | name (string) </br>age（int）  | 表示球员。</br>属性`name`表示姓名，`age`表示年龄。  |
+|Tag|   **team** |  name (string) |  表示球队。</br>属性`name`表示球队名。 |
+|Edge type|  **serve**  |  start_year (int) </br> end_year (int) | 表示球员效力球队的行为。该行为将球员和球队联系起来，方向是从球员到球队。</br>属性`start_year`表示效力的起始年份，`end_year`表示效力的结束年份。  |
+|Edge type|  **follow**  | degree (int)  | 表示推特上球员关注另一个球员的行为。该行为将两个球员联系起来，方向是从一个球员到另一个球员。</br>属性`degree`表示喜爱程度。  |
 
 !!! note