diff --git a/yiiguxing.translation.xml b/yiiguxing.translation.xml
index 3ffb04d..08ba9e1 100644
--- a/yiiguxing.translation.xml
+++ b/yiiguxing.translation.xml
@@ -4,6 +4,8 @@
   </component>
   <component name="Translation.States">
     <histories>
+      <item value="Whether this map contains the given [key]. Returns true if any of the keys in the map are equal to `key` according to the equality used by the map. ```dart final moonCount = &lt;String, int&gt;{'Mercury': 0, 'Venus': 0, 'Earth': 1, 'Mars': 2, 'Jupiter': 79, 'Saturn': 82, 'Uranus': 27, 'Neptune': 14 }; final containsUranus = moonCount.containsKey('Uranus'); true final containsPluto = moonCount.containsKey('Pluto'); false ```" />
+      <item value="The value for the given [key], or `null` if [key] is not in the map. Some maps allow `null` as a value. For those maps, a lookup using this operator cannot distinguish between a key not being in the map, and the key being there with a `null` value. Methods like [containsKey] or [putIfAbsent] can be used if the distinction is important." />
       <item value="Creates a new string by concatenating this string with itself a number of times. The result of `str n` is equivalent to `str + str + ...`(n times)`... + str`. ```dart const string = 'Dart'; final multiplied = string 3; print(multiplied); 'DartDartDart' ``` Returns an empty string if [times] is zero or negative." />
       <item value="shuffle" />
       <item value="Shuffles the elements of this list randomly. ```dart final numbers = &lt;int&gt;[1, 2, 3, 4, 5]; numbers.shuffle(); print(numbers); [1, 3, 4, 5, 2] OR some other random result. ```" />
@@ -19,8 +21,8 @@
     </histories>
     <option name="languageScores">
       <map>
-        <entry key="CHINESE" value="11" />
-        <entry key="ENGLISH" value="12" />
+        <entry key="CHINESE" value="13" />
+        <entry key="ENGLISH" value="14" />
       </map>
     </option>
   </component>