上下浮动的英文：
dipping and heaving

参考例句：

Volatility is the order of the day in the stock market.
上下浮动是股票市场整天的特点。

The sample could be maintained at any desired temperature with a variation of +/- 2°C by an electric furnace.
用电烘箱可将样品保持在任何所需的、上下浮动不超过2°C的温度上。

To ensure that all room rate charged is accurate, avoid any undercharge or overcharge that will cause disputes.
确保所有房间价格准确，避免任何会有争议的价格的上下浮动。

dipping是什么意思：
v. 浸，泡，蘸；下降；掏；把…伸入；把（汽车前灯的）远光调为近光；洗药浴
n. 浸渍；下降；药浴液

Their father was helping to dip the sheep.
他们的父亲在帮忙给羊群洗药浴。

He dipped a finger in it.
他把一个手指伸进里面蘸了一下。

The seagull dipped in the ocean.
这只海鸥在大洋上沾一沾水。

One limb dips to the north with a dip angle of 46 degrees and the other limb dips to the south with a dip angle of 48 degrees.
其中一个翼倾向北，倾角46度，另一个翼倾向南，倾角48度。

One limb dips to the north with a dip angle of 46 degrees.
其中一个翼倾向北，倾角46度。

heaving是什么意思：
举起, 拿起
扔去

Heave ho, my hearties!
伙伴们，用力呀！

To grieve and heave a sigh
惋惜嗟叹

The thought of it makes me heave.
一想到那事我就恶心。

His stomach heaved at sight of the mess.
他一见这伙食就作呕。

The storm heaved the sea into mountainous waves.
风暴在海面上掀起万丈波涛。