At the start of the frame, all 8 sprites are in their uppermost positions, so this is where we initialize them:
The export function enables you to share a text-file of the app's log. For nerds like me
，这一点在旺商聊官方下载中也有详细论述
Credit: Timothy Werth / Mashable
Percentile 99.9: 750.858 ms | 179.065 ms
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