This has been quite an achievement—not least because it was completed in just four years.

这是相当大的成就——不仅因为只在4年里就完成了票证电子化。

youdao

The NASA images show the loss of approximately 3.3% of the 33, 410 core zone of the reserve lost to logging in just four years.

NASA（美国航天局）的图片显示，保护区的中心地带的mianji33，410平方英里，由于4年的连续砍伐，大概有3.3%的面积遭到了破坏。

youdao

In just four years, he extricated the firm from consumer electronics and reinvented it as a provider of technical services to media firms.

仅仅四年时间里，他把公司从消费电子中抽身并重塑为一个媒体行业技术提供商。

youdao

"Over just the last three years, NHTSAs defect and compliance investigations have resulted in five hundred twenty-four recalls involving twenty-three million vehicles.

VOA: special.2010.02.26

I'm just making some kind of living in what I've been doing the last four years.

我就是在用我这四年学到的东西养家糊口。

幸福的定义 - SpeakingMax英语口语达人

"In the United States, one is expected to go to high school for four years and you get a diploma just for showing up or attending.

VOA: special.2010.02.25

The world has gone from zero to 60 billion mobile apps downloaded in just four years.

FORBES: Apps Lead the Way to the Next Innovation Hypercycle

In just four years, Harrison, now 34, has made remarkable strides with his charity.

FORBES: Tapping the Well of Philanthropy: Scott Harrison and Charity Water

Zynga has certainly been a rocket-ship of success, achieving what it has in just four years.

FORBES: Zynga Vs. Electronic Arts: Both Are 'Social' Competitors, But Who Has The Better IP?