An atom itself is a complete whole, with its electrons, protons and neutrons and other elements...一个原子本身就是一个完整的整体，包括电子、质子、中子及其他元素。The neutrons and protons form the core of the atom.中子和质子构成了原子核.A substance donates protons...
Galerie St. Etienne is holding three concurrent exhibitions.圣艾蒂安美术馆同时举办3场展览。In Paris Galerie Segoura has closed, as has Salvatore Romano in Florence.在巴黎GalerieSegoura倒闭了, 在弗洛伦萨的SalvatoreRomano也一样....
Receding gums can be the result of disease or simply incorrect brushing.牙龈萎缩可能是疾病导致的，也可能仅仅是错误的刷牙方式引起的。The bartender had a florid face and a receding hairline.酒吧男招待面色红润，前额有点脱发。Dealers grew concerned over the sliding dolla...