Thrust a rod from its last shoot down the stem; it shall point to the center of the earth as long as the tree lives.
从它初发的嫩枝旁沿茎插一根笔直的杆子；只要这树活着，杆子将一直指着地心。
2
To reiterate a very important point, three positions for a new FMO are necessary for the Minor Planet Center (MPC) to determine if a FMO's earth relative speed is accelerating or decelerating.