Taught in a group setting, these courses cover the basics of tree hazard assessment, line placement, ascending, descending and moving around in the canopy.

这门课程为团体教学，包含树木危险性评估、绳索放置、上升、下移、树木自由移动的基本知识。

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Read on to learn how to choose the best tree for you, put it up straight without a struggle, and keep it fresh, fragrant, and hazard-free —plus, secrets to holiday cleanup and ornament storage.

读下去，你会学到如何挑选最好的圣诞树，还有如何放置它：直立起来，不能有半点倾斜；让树保持旺盛的生命力，能始终散发出松树特有的芳香；要让它远离任何可能的伤害——除此之外，本文还会告诉你一些假期之后如何清扫和布置装饰品的小窍门。

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This paper summarizes the hazard, regularity and control technology of the rust disease of Malus micromalus tree in Hequ County.

就河曲县近年来海红果树锈病发生的危害、规律及防治技术进行了综述。

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He is alive and unhit by the same hazard that leaves one tall palm tree standing where a hurricane has passed.

CNN: He remembers Papa