The team identified the frequency of knots in the wood as the cause, returned to the sawmill, and selected each plank by hand, examining the pine for knots and other potential flaws before purchasing.
研究小组发现结木的频率是一大原因，于是他们返回到锯木厂，并重新选择每个板手，检查松木其他潜在的缺陷。
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