例如，在顶级窗口完全移动到屏幕之外或者某个子对象移动到容器视区边界外部的时候。
For example, when a top-level window is moved completely off-screen or a child object is moved outside the boundaries of the container's viewport.
摩托罗拉完全承诺在移动设备上采用Android是两家公司自然配合的众多原因之一。
Motorola's total commitment to Android in mobile devices is one of many reasons that there is a natural fit between our two companies.
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