tethern.系绳；系链；界限；（能力、财力、忍耐等的）极限v.练栓；拘束Tethered aerostats系留气球tethered hydro boat圆周竞速艇tether circumference牵引三角形tethered submersible带缆潜水器tethered spinal cord脊髓栓系Tethering spinal cord脊髓栓系tethered subsatellite绳系卫星tethered cord syndrome脊髓栓系综合征tethered vehicle fiber远载体系留光纤Tethered Radar Reflector系留雷达反射器