新手小白问题 android:theme 如果需要用到多个要怎么写？

[Fanny]

 <activity android:name=".AboutActivity" android:screenOrientation="landscape" 
        android:theme="@android:style/Theme.NoTitleBar"
        android:theme="@android:style/Theme.Translucent">
  </activity>

我希望又能隐藏上面的title，又能将当前的activity透明，可是如果这两条一起写的活，我保存时就提示错误
Multiple annotations found at this line:
- error: Error parsing XML: duplicate attribute
- Attribute "theme" bound to namespace "http://schemas.android.com/apk/res/android" was
already specified for element "activity".

正确的应用怎样设置呢？

[安卓android]

android:theme="@android:style/Theme.NoTitleBar.Translucent"

[Univac]

android:theme = "@android:style/Theme.Translucent.NoTitleBar"