摄动
对于静止卫星而言,由于地球结构的不均匀和太阳、月亮引力的影响,卫星的轨道参数随时发生变化,不断偏离开普勒法则确定的理想轨道,产生一定的漂移,此现象称为摄动。
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Complete the following sentence with a (compound) word derived from the one(s) given in bracket.
Tropical rainforest is a forest of tall trees in a region of year-round ( ) and plentiful rainfall. (warm)
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