drop worm shaft  落蜗杆轴

drop by drop  一滴一滴地

Archimedes worm and worm wheel  阿基米德蜗杆蜗轮

hindley worm hourglass worm  球面轫杆

Transmission of Mul-ti-Head Worm and Worm Wheel  多头蜗轮蜗杆传动机构

worm and [worm] gear  蜗杆与蜗轮

Worm and Worm Gear  蜗杆蜗轮; 蜗杆蜗轮机构

Worm and Worm Wheel  蜗杆蜗轮; 蜗杆和蜗轮

worm and worm wheel mechanism  蜗轮蜗杆机构

Worm Wheel and Worm  蜗轮蜗杆

Worm-Anti-Worm  蠕虫对抗蠕虫

Worm-gear and worm  蜗轮蜗杆

~+Drop tower tests  2型糖尿病; ~＋落塔试验

a drop  滴

a drop in the bucket  九牛一毛; 沧海一粟

a drop quiz  突击测验

abnormaL drop  不正常掉牌; 不正常降低; 不正常丢失

Abnormal flower and fruit drop  异常落花落果

Abrupt temperature drop  温度骤降