检验表明水生有壳动物的毒素水平提高了。Tests showed increased levels of toxin in shellfish.游客们可以看到一系列各种各样、色彩斑斓的水生动植物。Visitors can view a rich and colorful array of aquatic plants and animals.池塘虽小，但能为许多水生植物和鱼类提供足够的养分。The pond is quite small ...
But by the year 2020 business computing will have changed beyond recognition.但是到了2020年，商业计算会变得面目全非。Many graduates are employed in the electronics and computing industries.很多毕业生就职于电子和计算机行业。McNally has spent 17 years at th...