N son - carrier waves were modulated respectively with N paths symbol and got FDM signal.N路符号分别对N个子载波调制,得到FDM信号.Rapid prototyping manufacturing in the ice pattern is actualized through FDM and separate ejection.采用FDM方法、离...
By measuring the motion of the galaxies in a cluster, astronomers can infer the cluster's mass.通过测量星系在一个星系团内的运动,天文学家们可以推定这个星系团的质量。They turned their telescopes towards other nearby galaxies...他们把望远镜转向附近其他星系。Space fli...
The rainy season in the Andes normally starts in December.安第斯山区的雨季通常在12月份来临。I'll put the rest in the bank for a rainy day.我要把余款存入银行以备不时之需。Rainy weather brings blessed relief to hay fever victims.雨天会给枯草热患者带来欣喜,减轻他们的痛...
The gas , which is sulphur - free , contains 89 - 99 % methane, up to 6 % ethane, and 3 % propane.天然气不含硫, 含甲烷88-99%, 乙烷6%和丙烷3%.The cloud might be snowing ethane snowflakes into methane lakes below.云层可能正在向下面的甲烷湖飘落乙烷雪.BA 1...