New problems arose imperceptibly.不知不觉地出现了一些新问题.Imperceptibly, the boat had slowly turned.船慢慢地在转弯, 简直使人不觉得.Time fled, and she was surprised to find the year passed imperceptibly.光阴飞逝, 她诧异地发觉一年不知不觉就过去了....
Exciton is electron - hole pair held together by their mutual Coulomb interaction.激子就是由电子和空穴在相互间的库仑力作用下,相互维持在一起的电子 -- 空穴对.As to the emission at 370 nm, It'should result from exciton recombination radiation.而在370nm处的...
The visitors were swept past various monuments.游客们被带着走马观花地参观了各种纪念碑。Protective measures are necessary if the city's monuments are to be preserved.要保存城市古迹必须采取一些维护性措施。All architecture on the tableland is defensive, all...
He loved watching the birds we attracted to our yard with numerous feeders and birdbaths.它喜欢观看我们用无数喂食器和鸟澡盆吸引到院子里的鸟.Textured materials appropriate for birdbaths, streams , and pools include sand, stones , pebbles, and con...