by y mistake 错误地 ; 无意地 ; 弄错
y mistake
y的错误
以上为机器翻译结果，长、整句建议使用 人工翻译 。
It said another will be placed at the summit to identify where the Watkin Path begins while another one will identify the dangerous Bwlch y Saethau which walkers often make the mistake of descending.
BBC: Snowdon: Pillars to guide walkers on paths
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