The manipulative taches easy of needle stab mainly included needle extraction (37 37%), needle bending and destroying (22 89%).

易导致针头刺伤的操作环节主要是拔取针头（37 37% ） ，将针头折弯、毁型（2 2 89% ） ；

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The cembrene is a natural organic compound. A colowless needle crystal was obtained by extraction and separation, from red pine tree.

松柏烯是从红松树中提取和分离出来的一种天然有机物。

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