Mutual protection against wind is distinctly recognizable at the crown canopy . 在林冠层可以清楚地看到互相保护免遭风害的作用。
2.
Maintenance standards for civil aircraft . unit 2 : ground safety . part 48 : prevantion and handling for typhoon , storm and gust for civil aircraft 民用航空器维修标准.第2单元:地面安全.第48部分:民用航空器的风害防护