A steady stream of California traffic clogs the air with pollutants.加利福尼亚川流不息的车流使空气中充斥着污染物。Most cities generate a complex brew of pollutants.多数城市都会产生各种物质混杂的污染物。Pollutants are constantly being released into the atmosphere...
Development of detergents has required optimization of the surfactants structure.发展洗涤剂时,要求使用最恰当的表面活性剂结构.In the case of productivity tools and other non - entertainment - oriented products, this optimization means minimiz...
The avenues lined with jacaranda trees burst into a carnival of purple.大街的两旁种着蓝花楹，绽放的花朵汇成一片紫色的海洋。S ? o Paulo , while not lovely, has more shaded jacaranda lined avenues than you might expect.圣保罗 尽管不美, 但两侧栽有蓝花楹的林荫大道比你能够想象...
Lung cells die and are replaced about once a week.肺细胞约每周新老更替一次。Their indecision has been replaced by confidence and steely determination.他们的优柔寡断已经被自信和钢铁般的决心所取代。At last the sobs ceased, to be replaced by sniffs.最后，啜泣终于止住了...