Mills start with a hard, strong construction grade wood like Douglas fir, and then preservative chemicals are injected under pressure to limit the effects of insect and rot damage.
米尔斯开始用硬，强固的构造像花旗松级木材，然后防腐剂化学品的压力之下，以限制昆虫和腐烂造成的损害减少注射。
Mills start with a hard, strong construction grade wood like Douglas fir, and then preservative chemicals are injected under pressure to limit the effects of insect and rot damage.
米尔斯开始用硬，强固的构造像花旗松级木材，然后防腐剂化学品的压力之下，以限制昆虫和腐烂造成的损害减少注射。
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