planet
n.
行星；地球(尤指环境)
1.
The orientation of the planet's orbit is changing continuously.
该行星轨道的方向不断变化。
2.
Scientists are studying photographs of the planet for signs of life.
科学家仔细察看行星照片，寻找生命迹象。
3.
The planet Jupiter may have no solid surface at all.
木星表面可能根本就不是固体的。
4.
Is there intelligent life on other planets?
在其他星球上存在具有智力的生命吗？
5.
Does life exist on other planets?
其他行星上有生命吗？
