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double-side wood planer：双面木工刨床

double-side tipping wagon 双边倾卸车 | double-side wood planer 双面木工刨床 | double-sideband signal generator 双边带信号发生器

double-surface wood planer：双面木工刨床

double-surface transistor 双面晶体管 | double-surface wood planer 双面木工刨床 | double-swiveling uncoiler and recoiler 并列回转式开卷-卷取机

double-head wire stitching machine：双头铁丝订书机

double-head tyre 双缘轮胎 | double-head wire stitching machine 双头铁丝订书机 | double-head wrench 双头扳手

double rail track circuit：双轨道电路

double pole switch 双刀开关 | double rail track circuit 双轨道电路 | double range drive 双量程传动

double rail track circuit：双轨轨道回路

"double radial engine","双排星形发动机" | "double rail track circuit","双轨轨道回路" | "double reduction","双级减速"

double rail track circuit：雙軌條軌道電路

3140 double-rail retarder 雙軌條車輛減速器 | 3141 double-rail track circuit 雙軌條軌道電路 | 3142 double-sided shunting signal 雙面調車信號機

double side razor blade：双面保险刀

double saw 复齿锯 | double side razor blade 双面保险刀 | double spine saw 复齿锯

double side razor blade：双面保险儀

double saw复齿锯 | double side razor blade 双面保险儀 | double spine saw复齿锯

double rear vault：双臂腾越

double play 雙殺 | double rear vault 雙臂騰越 | double referee system 雙裁判制

double wheel plow：双轮犁

double webbed wheel ==> 复板轮 | double wheel plow ==> 双轮犁 | double winding armature ==> 双绕组电枢

dioptric：折射光学的

dioptre 屈光度 | dioptric 折射光学的 | dioptrics 折射光学

Saturdays are fun：星期六很有趣

6. Saturdays are fun.星期六很有趣. | fun 为不可数名词,"快乐,有趣",在此做表语. | That must be fun. 那一定很有趣.