Both ionization and excitation lead to eletronic transitions that may be the emission of light.电离和激发都将导致可能伴随有光发射的电子跃迁.Forbidden transitions are those for which dipole radiative transitions are not allowed by the selectio...
它予人彷佛是狐皮的感觉.It feels as if it were the fur of a fox.狐皮对于居住在寒冷地区的人们非常有用.The fox had high value for settlers in cold areas.这件上衣的领子是狐皮的.The collar of this coat is fox....
The songs were both catchy and original.那些歌曲既上口，又富有原创性。The initiative has been given the supposedly catchy title of the 'Citizen's Charter'.提案取了个据说很容易记住的名字，叫做《公民宪章》。The song's so catchy it makes you b...
喝河水很容易闹肚子。It's easy to get a tummy upset from river water.这些堤坝限制了河水顺流而下。These dams have restricted the flow of the river downstream.流入湖中的泉水和河水携带了溶于水的硝酸盐和磷酸盐。Springs and rivers that drain into lakes carry dissolved n...