For much of the past 20 years , three companies have alternated in the role of the largest , by value , on the american stockmarket : exxon mobil , general electric and microsoft .
过去20年,三个公司轮番成为美国股票市场最有价值公司:埃克森美孚、通用电气、微软。
For 10 years , she and her political rival nawaz sharif alternated terms as prime minister .
有大约十年的时间,她和她的政治对手纳瓦兹谢里夫轮流担任内阁总理。
And her behaviour to all of us alternated between seductive charm and sudden hostility .
她对我们时而表现出迷人的魅力,时而表现出突然的敌意。
The grand canyon also demonstrates that uplift and subsidence alternated , since it contains plant fossil layers sandwiched between marine fossil layers .
大峡谷还向人类展示出,地层的上升与下沉是交替进行的,因为在海相化石层之间夹杂有植物化石层。
Even though the country was an established democracy , a string of weak and short-lived coalition governments alternated with the occasional coup staged by a powerful army .