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up-and-down motion：垂直方向往复运动

up-and-down maneuver ==> 升降机动 | up-and-down motion ==> 垂直方向往复运动 | up-and-down movement ==> 垂直往复运动,垂直运动,升降运动,上下运动

up-and-down traffic：上下行運行

11065 up-and-down track 到發線 | 11066 up-and-down traffic 上下行運行 | 11067 up-and-down trains 上下行列車

step-down ratio：降压比

step down n. 缩小 | step down ratio 降压比 | step down side 降压侧

step-down substructure：阶梯式基座

step-down method逐渐减少分配法 | step-down substructure阶梯式基座 | step-down transformer降压变压器

b.He set down the book on the bable：他把书放在桌上

eg. a. Set down his name and address. 记下他的名字和地址. | b.He set down the book on the bable . 他把书放在桌上. | c. I set the man down as a solier. 我以为那人是个士兵.

screw-down valve：螺杆阀

screw down stop vlave 截止阀 | screw down valve 螺杆阀 | screw down valve 螺旋阀

screw-down stop check valve：截止止回阀

截止止回安全阀 screw-down stoop check and safety valve | 截止止回阀 screw-down stop check valve | 截止止回节流阀 screw-down stop check and throttle valve

breaking down field strength：击穿场强

breaking down dield strength 击穿场强 | breaking down field strength 击穿场强 | breaking down point 断裂点

completely knocked down：全部拆卸的完全击倒完全低价完全拆开

completely knocked down 全部拆卸的 | completely knocked down 全部拆卸的完全击倒完全低价完全拆开 | completely knocked down 完全击倒完全低价完全拆开

knocked down packing：拆卸包装

knocked down condition 拍卖情况 | knocked down packing 拆卸包装 | knocked down shipment 拆卸分运

fibrosarcoma：纤维肉瘤

1.纤维肉瘤 纤维肉瘤(fibrosarcoma)起源于成纤维细胞,是纤维组织的恶性肿瘤,多见于5岁以下,有些患儿出生时即发现,也称"先天性及婴儿纤维肉瘤",男孩略多于女孩.

Oriya：探源;起源;发源

origination, data 原始起点 | Oriya 探源;起源;发源 | ormal contact 资料源生;资料起源