self-troughing idler自动: voluntarily; of one's own ac ...成: accomplish; succeed槽: trough; manger托: support from under滚: roll; turn round; trundle下载手机词典可随时随地查词查翻译关注微信公众号：chachacidian，回复:自动成槽托滚，即可在微信中查询翻译
