Updated Linq to Sql (markdown)

Linq-to-Sql.md

@@ -1,37 +1,37 @@
 [中文](LinqToSql) | **English**
 
-原本不支持 IQueryable 主要出于使用习惯的考虑，编写代码的智能总会提示出现一堆你不想使用的方法（对不起，我有强迫症），IQueryable 自身提供了一堆没法实现的方法，还有外部入侵的扩展方法，严重影响编码体验。如下图：
+Originally not supporting IQueryable is mainly due to the consideration of usage habits. The intelligence of writing code will always prompt a bunch of methods you don't want to use. IQueryable itself provides a bunch of methods that cannot be implemented, as well as external intrusion extension methods, which seriously affect Coding experience. As shown below:
 
 ![image](https://user-images.githubusercontent.com/16286519/57295126-5dd7bd00-70fc-11e9-99c0-d1c46423afa2.png)
 
-v1.4.0+ 版本请使用以下命令安装（老版本不需要安装）：
+For FreeSql v1.4.0+ version, please use the following items to install with commands (old version does not need to be installed):
 
 > dotnet add package FreeSql.Extensions.Linq
 
-## 特别说明
+## Special Note
 
-* 请尽量不要在 ISelect 模式下的使用 Linq 方法：GroupJoin、Select、SelectMany、Join、DefaultIfEmpty；
+* Please try not to use the following Linq methods in `ISelect` mode: `GroupJoin`, `Select`, `SelectMany`, `Join` and `DefaultIfEmpty`.
 
-* 如果一定要在 ISelect 中使用 .Select() 方法，请务必在 .ToList() 之前调用它；
+* If you must use the `.Select()` method in `ISelect`, be sure to call it before `.ToList()`.
 
 ## IQueryable
 
-FreeSql 提供强大的数据查询对象 ISelect。
+FreeSql provides a powerful data query object: ISelect.
 
-FreeSql.Extensions.Linq v1.4.0+ 实现了 IQueryable 查询对象常用功能，以便在各框架中交互使用。
+FreeSql.Extensions.Linq v1.4.0+ implements the common functions of IQueryable query objects for interactive use in various frameworks.
 
 ```csharp
-//将 ISelect 转为 IQueryable
+//Convert ISelect to IQueryable
 IQueryable<Student> queryable = fsql.Select<Student>().AsQueryable();
 
-//Linq 方法查询
+//Linq Query
 var t1 = queryable.Where(a => a.id == 1).FirstOrDefault();
 
-//将 IQueryable 还原为 ISelect
+//Restore IQueryable to ISelect
 ISelect<Studeng> select = queryable.RestoreToSelect();
 ```
 
-注意：IQueryable 的实现目前不支持 GroupBy，可以考虑使用 RestoreSelect 方法转回 ISelect 进行查询
+Note: The implementation of IQueryable does not currently support `GroupBy`. You can consider using the `RestoreSelect` method to switch back to `ISelect` for query.
 
 ## Where
 ```csharp