seven years

基本解釋

The two patterns alternate over periods of two to seven years in the tropical Pacific.
在熱帶的太平洋地區(qū)，這兩種現(xiàn)象的交替周期超過了兩到七年。
Some economists suggest that over the next seven years Turkey’s growth will match or exceed that of any other big country except China and India.
一些經(jīng)濟學家表示，七年之后，除了印度和中國，土耳其的增長速度將會匹敵甚至超過其他任何一個大國。
Seven years are not that long a period, yet, much must have changed since then.
七年并不是那么長的一段時間，但自那以后，很多東西肯定都已經(jīng)變了。

At the age of six or seven years old, Emmanuel became a soldier for the Sudan People's Liberation Army.
But,it's hard,if you're fourty-seven years, your job is a pretender to the throne, it's difficult.He had a hard time getting around.
但是,如果你要花四十七年,去爭奪王位,是很不容易的,他做得很艱苦
耶魯公開課 - 1871年后的法國課程節(jié)選
Well, I started playing baseball when I was really young, about...I think I was seven years old,
我很小的時候就開始打棒球了，大概是……，我想那時候我大概七歲吧，
會打棒球嗎？ - SpeakingMax英語口語達人

It's been out there for at least seven years, maybe 10 years, mainly in hospitals.
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