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1·First, we know that the planets all orbit close to the earth's orbital plane, the ecliptic.

首先，我们知道所有行星的轨道都很靠近地球的轨道平面——黄道面。

2·The optimization performance index is to maximize the orbital plane change, and the optimal lift and bank control law are obtained.

以目标轨道面倾角最大为优化性能指标，获得了升力和滚转角的最优控制规律。

3·Pi orbitals are a molecular orbital that have a nodal plane through the bond axis.

轨道是沿着键轴,有节面的分子轨道。

4·This will use an American rocket plane developed by California's Scaled Composites company to send fare-paying passengers on sub-orbital trips.

这个项目将使用一个是由加利福尼亚的Scaled Composites公司发明的美国火箭飞船将付费乘客送往太空亚轨道旅行。

5·The orbital space plane promises to be much safer than the shuttle.

轨道太空飞机应该较太空梭来得安全。