backfire：逆火(弄巧成拙,適得其反)

back on track重上軌道(改過自新) | backfire逆火(弄巧成拙,適得其反) | ball and chain 鐵球鐵鏈,甜蜜的枷(老婆)

tracing point：描跡針

tracing paper 描圖紙 | tracing point 描跡針 | track ball 轉球

Track and Field Events：田徑比賽

47. Watching the Olympics 觀看奧運會 | 48. Track and Field Events 田徑比賽 | 49. Ball Sports 球賽

Track and Field Events：田徑

40 The Olympics 奧運 | 41 Track and Field Events 田徑 | 42 Ball Sports 球類運動

Ball track：球溝道,軸承滾道

ball thrust bearing 推力滾珠軸承,滾珠止推軸承 | ball track 球溝道,軸承滾道 | ball transplanting 帶土包扎移植

outer-race ball track：外環(huán)滾道

outer-product 向量積 | outer-race ball track 外環(huán)滾道 | outer-shell electron 外層電子

ball transplanting：帶土包扎移植

ball track 球溝道,軸承滾道 | ball transplanting 帶土包扎移植 | ball tube 滾珠循環(huán)導管

automatic high-speed track grinder for ball bearing inner ring：自動高速軸承內圈溝磨床

automatic high speed refrigerated centrifuge 自動高速冷卻離... | automatic high-speed track grinder for ball bearing inner ring 自動高速軸承內圈溝磨床 | automatic highway crossing signal lamp 自動道口信...

track gauge：軌道尺

track gauge level gauge 軌距水平測量儀 | track gauge 軌道尺 | track grinder for ball bearing inner race 球軸承內圈滾道磨床