在树干上切一道大约半英寸长的口子。Make a slit in the stem about half an inch long.沿水平方向整齐地锯断树干。Cut horizontally and cleanly through the stem.树干的直径the diameter of a tree trunk...
Alternators take power from the engine when they produce electricity.交替发电机从引擎那获得能量,当它们制造电能的时候.Description: Shanghai Focar, alternators and components, distributors and components, electric parts andand oil.汽车 起动机 、 发电机整机...
After extensive research, Albert Hoffman first succeeded in synthesizing the acid in 1938.经过大量研究，艾伯特·霍夫曼于1938年首次成功合成了该酸性物质。Dr Hoffman did his postgraduate work at Leicester University.霍夫曼博士是在莱斯特大学读的研究生。Nine - year - old ...