外行 1.(外行的人) laymen; nonprofessional; outsider2.(不懂或没经验) lay; unprofessional 种庄稼他可不外行。 he's no amateur in farming.; 外行话 lay language; a mere dabbler's opinion
For example , if there is a planet orbiting around the neutron star , it will wobble a little and the pulses will come a little early or late . we can then deduce the mass and the radius of the orbit of the planet from the arrival time of the pulses . this is how the first extrasolar planet is discovered 例如假若有一颗行星围绕一颗中子星运行,它会令中子星出现摇动,引致脉冲的间隔变长或短,由此我们根据脉冲周期的变化,可推断出行星的质量和轨道半径,这亦是天文学家找出第一颗地外行星时所用的方法。