这些层可以被动态的增加或删除，你也可以对这些层进行改动，因为每层都有一个轨道，你可以在轨道中的特定时间点加入关键帧到达改变动画的目的。
These layers and be added or removed dynamically and you can change each layer as it has a track that lets you change it as a function of time by inserting keys at certain frames in the track.
当推送尤里·加加林进入轨道的预定时刻来临之际，他只是简单地按下一个按钮闭合点火电路并看着发动机启动。
When the appointed time came to blast Yuri Gagarin into orbit, he simply pushed a button that completed the ignition circuit and watched the motors start.
所以现在放下轨道，什么是功率，就是，一定时间内被做的功。
So I will abandon for now the orbits entirely What is power? Power is work that is done in a certain amount of time.
航天飞机已按预定时间进入轨道，从而使它至少能绕地球运行一周。
The shuttle went into orbit on schedule to enable it to circle the earth at least once .
加入WTO的本质就是将中国经济在规定时间内纳入经济全球一体化的轨道，中国医药市场当然也会受到重大影响。
Joining WTO means bringing the Chinese economy into the global economic integration, which will have a great impact on the Chinese medical market.
针对圆(近圆)轨道航天器相对运动的固定时间状态转移问题，提出了一种基于导航点的多脉冲优化轨迹生成策略。
An optimal trajectory generation strategy based on way-points is presented to solve the fixed-time state transition for spacecraft relative motion in a circular orbit.
当光学系统口径一定时，在相同的轨道高度条件下，增大焦距可以提高地面分辨率，增大系统的视场角可以扩大对地面的覆盖宽度。
When the aperture diameter of an optical system is fixed with the same orbit height, the resolution of ground objects can be improved by increasing the focal length.
航天飞机已按预定时间进入轨道，从而使它至少能绕地球运行一周。
The shuttle went into orbit on schedule to enable it to circle the earth at least once.
航天飞机已按预定时间进入轨道，从而使它至少能绕地球运行一周。
The shuttle went into orbit on schedule to enable it to circle the earth at least once.
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