商品现在可以在欧盟各国自由流通。Merchandise can now circulate freely among the EU countries.根据欧盟的一项新指令，杀虫剂的标签标注将更加明确。Thanks to a new EU directive, insecticide labelling will be more specific.药品可以用不同的商标在欧盟各国出售。Drugs can be sold under dif...
What are the pigeons doing outside? Eating, sleeping, propagating!门外的那些鸽子在干什么? 吃, 睡, 繁衍!The model shows a wave propagating from left to right through air.该模型表明,波从左至右通过空气.First, why do we get light propagating at all?首先, ...