While the planetary nebula phase is thought to last for around 10, 000 years, astronomers estimate the age of the outer filamentary portions of this halo to be 50, 000 to 90, 000 years.
虽然行星状星云阶段持续约1万年，天文学家估计其外晕的丝状物质年龄在5万至9万年间。
That day, halo dark room, the smell of damp so I adapted a bit, watching the emaciated old man, tortured by pain dark shed tears, shook hands ticking phase coated with a fleeting tears.
那日，晕暗的房间，潮湿的气味让我有点不那么适应，看着眼前消瘦的老人，被病痛折磨的黯淡流下了泪光，相握的双手滴滴答答沾上了流年的泪光。
Flower for the halo for old eyes, multi-frequency phase ashamed ape Crane asked.
老眼作花花作晕，多惭猿鹤频相问。
The application of phase transfer catalysis in fluorination of halo-aromatic compounds, mechanism, variety and reaction condition of fluorination are reviewed in this article.
从相转移催化剂的种类、原理、反应条件以及它在卤代芳香族化合物氟化反应中的应用等方面对相转移催化剂的作用进行概括和总结。
The application of phase transfer catalysis in fluorination of halo-aromatic compounds, mechanism, variety and reaction condition of fluorination are reviewed in this article.
从相转移催化剂的种类、原理、反应条件以及它在卤代芳香族化合物氟化反应中的应用等方面对相转移催化剂的作用进行概括和总结。
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