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Back gear：背轮

back freight 回运货物运费(抵港后无法交货 | back gear 背轮 | back ground noise level 背景噪音电平

Back gear：倒挡齿轮

back gear shaft 背齿轮轴 | back gear 倒挡齿轮 | back geared motor 带减速齿轮的电动机

back gear shaft：背齿轮轴

back flap hinge 明铰链 | back gear shaft 背齿轮轴 | back gear 倒挡齿轮

back gear ratio：倒擋轉速比

"倒退齿轮,倒挡齿轮,后列齿轮","back gear" | "倒挡转速比","back gear ratio" | "后导板","back guide"

back goods freight：退货费用,退货运费

back gluer 书脊上胶机,胶背机 | back goods freight 退货费用,退货运费 | back gouging 刨焊根,背刨

back goods freight：退货运费

back goods 退货 | back goods freight 退货运费 | back letter 保函

back line：回头缆

back lighting 背面照明 | back line 回头缆 | back lobe 后瓣

back line：背线

\\"背脂\\",\\"back fat\\" | \\"背线\\",\\"back line\\" | \\"回复突变\\",\\"back mutation,reverse mutation\\"

center back line：后中线

center back fold 后中对折 | center back line 后中线 | center back neck point to waist 后颈点至腰

center back line：后中心线

后中缝 back center seam | 后中心线 center back line | 背缝线 center back seam line

artificial color：人工色素餐食飲料

5745人工成本金融成本會計cost of labor | 5746人工色素餐食飲料artificial color | 5747人工受孕人類生育artificial insemination

nymphal moult：若虫脱皮

nymphal molt 若虫脱皮 | nymphal moult 若虫脱皮 | nymphal stage 若虫时期