To maintain their survival, search engine companies have to seek the dangerous tradeoff between search quality and money.
为了维续他们的生存，搜索引擎公司不得不在搜索质量与金钱之间进行冒险的权衡。
Seek foreign papers search engine site?
求国外论文搜索引擎的网站？
Recently more and more concern over air-pollution and decrease of oil reserves has forced scientists of many nations to seek alternatives to the internal combustion engine powered automobiles.
由于人们对空气污染和原油储量减少现状的认识，世界各国的科学家试图寻找燃油发动机的替代物。
Recently more and more concern over air-pollution and decrease of oil reserves has forced scientists of many nations to seek alternatives to the internal combustion engine powered automobiles.
由于人们对空气污染和原油储量减少现状的认识，世界各国的科学家试图寻找燃油发动机的替代物。
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