常見例句雙語例句It starts from the objective fact that anti - America activi-ties have been increasing since 1960s and analyses the main causes that lead to the phenomenon.主要從二十世紀六十年代以來反美國際恐怖主義活動日益頻繁的現象出發(fā)，分析了造成這一現象的主要原因。H bonds on facing folded chain crystal surfaces lead to a decrease of surface free energy and this fact is a main reason for the formation of double lamellae.在雙層片晶界麪上的H鍵降低了表麪自由能，這是形成雙層片晶的主要原因。 返回 main fact lead