let list of candidates = N closest colours to pixel
What I found is that written evidence for knocking on wood (and for the history of gesture as a whole) is remarkably sparse. In the Penguin Guide to Superstitions, folklorist Steve Roud offers a skeptical take on the provenance of knocking on wood due to the near total absence of written records about it:
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（三）及时向公安机关、网信部门报告重大威胁情报和程序样本。
根据弗若斯特沙利文报告，按2024年收入计，兆威机电是中国最大的一体化微型传动与驱动系统产品提供商，也是全球第四大一体化微型传动与驱动系统产品提供商，市场份额分别为3.9%和1.4%。