上下的英文：
all
old and young
up and down
about

She is forty or thereabout(s.
她四十岁上下。

He's between the upper and nether millstone.
他深受上下夹攻。

The small boat was bobbing on the rough water of the lake.
小船在汹涌的湖面上下摆动。

racers neck - and - neck at the finish.
赛跑者在终点处不分上下

Bounce a child on one's knees
把小孩放在膝盖上上下颠动着

Articulated with the tip of the tongue turned back and up toward the roof of the mouth;retroflex.
卷舌音的舌尖在嘴中前后上下运动而发出清晰的声音;卷舌音的

Negative coefficients occur where there is a decrease in acoustic impedance across the reflecting interface
当反射界面上下两侧的声波组抗降低时，反射系数就会出现负值。

Shift range: 0～170degree, upper and lower limit can be set in program.
移相范围：0~170度，上下限值可在程序中设置。

A Japanese game for two, played with counters on a board that is ruled with19 vertical and19 horizontal lines
围棋日本的一种两人棋戏，用棋子在一横竖皆有十九条交叉线的棋盘上下

Sweep flame around tube in short strokes up and down at right angles.
然后围绕着管道短距离上下交替对管道进行火焰烘烤，并以适当的角度旋转管道，避免烧穿管道。

The policy of burn all,kill all,loot all
三光政策

It is all on the house.
费用全由敝店支付。

(all) in a twitter
(极度) 紧张[兴奋],激动

The Old Mandarin
老官吏

You old misery!
你这个爱抱怨的老家伙！

It is an old aphorism.
这是一句老格言。

You young monkey
小淘气鬼

It is written by an obscure young poet.
这是一位不知名的年轻诗人写的。

The young man has a fine person.
那小伙子相貌堂堂。