如果你等待，发生的只有变老。If you wait, all that happens is that you get older.当生活很艰难，你想要放弃的时候，请记住，生活充满了起起落落，如果没有低谷，那站在高处也失去了意义。When life gets hard and you want to give up, remember that life is full of ups and downs, and without the...
The amount of light available for astrophysical analysis are usually so small.对天体物理分析来说,可接收到的天体光量是相当小的.Much astrophysical information is to be obtained from the intensity of absorption or emission lines.许多天体物理信息要根据吸收线或发射...
The spray quality is improved when the relative speed and length of indent chamber increase.随著缩进长度增大,雾化质量明显变好.And the relative speed value is less than 2 % by the engine speed regulator.和相对速度值小于2%的发动机转速调节....