cloud n. 1.云。 2.云状尘埃、烟(等);(鸟、虫、飞机等的)大群,大队。 3.(水晶等的)雾斑,(镜子等上的)云斑。 4.(显出疑惑、不满、悲哀等的)阴郁脸色;遮暗物,阴影。 5.(编结的质地轻柔的)女围巾。 6.(名誉等的)污点。 a cloud of steam 雾气。 a cloud of dust 一团尘雾。 a cloud of birds (像云一样的)一大群鸟。 a cloud of arrows 一阵稠密的乱箭。 a cloud of words 暧昧话。 be lost in a cloud 烟消云散。 be lost in the cloud 隐入云中。 blow a cloud 〔俚语〕抽烟,吞云吐雾。 cast a cloud (up)on 在…上投下一层暗影。 Every cloud has a silver lining. 乌云朵朵衬白底,黑夜漫漫有尽头;任何困难情况都有可盼的希望。 drop from the cloud 从天而降。 (lose oneself) in the clouds 1. 在云层中;[喻]虚无飘渺。 2. (人)空想,呆想,茫然;(事情)不落实,不现实。 kick the clouds 〔俚语〕被绞死。 on a cloud〔俚语〕满心欢喜,兴高采烈。 under a cloud 不得意,失宠,受嫌疑,遭白眼,处困境。 under cloud of night 趁黑。 wait till the clouds roll by 等乌云散开,等时机到来。 vt. 1.使乌云密布,使变黑暗。 2.在(心)上投下苦恼的[忧愁的]暗影,使心情黯然。 3.破坏(名誉),损伤(友谊)。 face clouded with anger 因为生气而面色阴沉。 vi. 1.云层密布,变黑暗;(镜面等)布满云斑。 2.(心)变忧郁,变黯然(over, up) (脸色)阴沉下来。 adj. -less 无云的,晴朗的。 n. -let 微云,朵云,片云。
The electron clouds are clearly visible as blurs surrounding the invisible nuclei . 电子云就象环绕着看不见的核的一片云雾。
Apart from x - rays which are emitted by excitation of electron clouds , most of the ionizing radiation come from the 射线是由受激发的电子云射出,而其他的电离辐射主要是由
Rays are emitted from the nuclei of unstable atoms during radioactive decay , while x - rays are from the electron cloud as the result of electron excitation 射线是由不稳定原子核射出的,而射线则由受激发的电子云射出。
Rays are emitted from the nuclei of unstable atoms during radioactive decay , while x - rays are from the electron cloud as the result of electron excitation 射线是由不稳定原子核射出的,而射线则由受激发的电子云射出。
This bond is a weak electrostatic force of attraction between the pro ton of a hydrogen atom and the electron cloud of a neighboring electro - negative atom 氢键是氢原子核及其相邻的负电荷原子的电子云之间的一种微弱的静电吸引力。
To give readers an example : the electron cloud of a hydrogen atom on earth is essentially distributed spherically around the hydrogen nucleus . but interesting things occur when we place a hydrogen atom in a strong magnetic field of 8 x 10 举例说,在地球上,氢原子的电子云呈球状分布在氢的核心内但当你把一颗氢原子放在8x10