1. A novel OFDM channel estimation method named compounded pilot is proposed which is based on the combination of comb pilot in frequency domain and superimposed pilot in time domain. 本文主要创新点在于把频域梳状导频和时域叠加导频结合起来，提出一种组合导频信道估计方法。
2. Our Hong Kong Light Pollution Survey uses the Sky Quality Meters (SQM) to measure the night sky brightness. The unit of night sky brightness is magnitude per arcsecond square. 我们的香港光害调查利用夜空光度测量表（SQM），量度夜空的光度，单位是等每平方角秒。
3. Our Hong Kong Light Pollution Survey uses the Sky Quality Meters (SQM) to measure the night sky brightness. The unit of night sky brightness is magnitude per arcsecond square. 我们的香港光害调查利用夜空光度测量表（SQM），量度夜空的光度，单位是等每平方角秒。
4. With the helicopter flying from right to left, start pirouetting, before the helicopter passes in front of the pilot, start a roll away from the pilot, while pirouetting. 直升机由右向左飞行，机体开始自旋，在直升机未到达操控者的正前方时，机体保持自旋并且执行外侧侧滚（飞离操控者）。
5. A daunting number of hours as a fighter pilot - better yet, a test pilot - which was why he was going into the Air Force after graduation. 还要求作为一个战斗机驾驶员--最好是试飞员--的惊人的飞行时数，这就是他为什么要在毕业后进入空军的缘故。
