但有一种保持图层大小不变的快捷方法。
However, there is a quicker way that preserves the accurate size of that layer.
,速度改变了方向，但它的大小不变。
The velocities reverse directions, but the speeds remain the same.
有小道消息称，下一代iPhone将在保持大小不变的基础上，配备4英寸显示屏。
There are rumors that the next iPhone will have a four inch screen on the same sized device.
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