大幅的英文：
a big margin
substantially

参考例句：

Government revenues fell dramatically.
政府财政收入大幅下降。

The government promises to slash taxes.
政府许诺大幅减税。

A large,multicolored graffito.
大幅涂鸦巨大的、多彩的乱涂乱画

The number of indies also plummeted.
独立音乐公司的数量也有大幅下降。

Affected by strong cold air , Yantai experienced a big drop of temperature on Sunday.
当日，受强冷空气影响，山东省烟台市大幅降温。

Affected by strong cold air, Yantai experienced a big drop of temperature on Sunday.
当日，受强冷空气影响，山东省烟台市大幅降温。

The huge price increase was unpopular among smokers and undermined support for high tobacco taxes.
香烟价格的大幅增长没有受到吸烟者的欢迎，反而使社会对较高烟草税的支持下降了。

GBP performed well and triggered the stop loss of our earlier short position.
昨天英镑大幅造好，早前的短线淡仓亦已蚀65点子。

rad moves on a skateboard.
在滑雪板上的大幅动作

The government promises to slash taxes
政府许诺大幅减税。

big是什么意思：
adj. 大的；庞大的；量大的；重要的
adv. 夸大地；大量地

Big, Big, Big....Innuendo, deleted
老大哥，老大哥，老大哥……

big commerce, big circulation, big market
大商业，大流通，大市场

You are big in america.
你在美国是个大人物。

margin是什么意思：
n. 边缘；利润；余地；页边的空白；差额，差数；极限
v. 加旁注于；加边于

marginal initial
边缘原始细胞[见于植物]

We came to the margin of the wood.
我们来到树林的边缘。

margin release mechanism
极限释放机构

substantially是什么意思：
adv. 实质上；大体上；充分地

to hypostatize; to substantiate
使实体化

This is a substantial building.
这是个坚固的建筑物。

The architecture of this house is very substantial.
这座房子的结构很牢固。