self balancing device

self-culti-vation是什么意思 self-assurassurance是什么意思 self--cultivation是什么意思 self-classification是什么意思 self-immobilization是什么意思 self-employemployed是什么意思 self-categorization是什么意思 self-recoverecovery是什么意思 self-deconstruction是什么意思 self-neutralization是什么意思