Patch: template-syntax's new contents.

public/docs/ts/latest/guide/template-syntax.jade

@@ -1418,14 +1418,22 @@ block style-property-name-dart-diff
 .l-main-section
 :marked
   ## Two-way binding
+  
+  ## 双向数据绑定
+  
   We often want to both display a data property and update that property when the user makes changes.
+  
+  在用户作出更改时，我们经常要同时显示和更新数据属性。
 
   On the element side that takes a combination of setting a specific element property
   and listening for an element change event.
+  
+  在元素层面上，既要设置元素属性，又要监听元素事件变化。
 
   Angular offers a special _two-way data binding_ syntax for this purpose, **`[(x)]`**.
   The `[(x)]` syntax combines the brackets 
   of _Property Binding_, `[x]`, with the parentheses of _Event Binding_, `(x)`.
+  
 .callout.is-important
   header [( )] = banana in a box
   header [( )] = 盒子里的香蕉