Add a skip button?

For some colors, it is kind of hard to clearly say "this is red or blue or green". For such cases, I believe a skip button would be nice, which would of course require some special handling on both loading and sending the data.

首先找到颜色标注界面，以及加载和发送颜色数据的代码。跟踪已提交的标签如何经过这两条路径，然后确定应如何表示跳过的颜色，以及应如何识别完成状态。完成的标准是用户可以跳过有歧义的颜色，而不会破坏加载或提交。

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