只有成功完成第二步以后，新附加的数据才可见。
The newly attached data is visible only after the second step successfully completes.
最早的夏威夷冲浪者是把肚子贴在长板上前进的，我们现在知道他们第二步才站起来的。
While the first Hawaiian surfers may have ridden their long boards on their stomachs, we know that they soon started standing on the board.
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