There's only four days left.

只剩下四天了。

《牛津词典》

Only four British players have entered for the championship.

只有四名英国运动员报名参加锦标赛。

《牛津词典》

He danced only four dances!

他只跳了四支舞。

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History records say that in only four years the area around Dawson produced more than fifty-one million dollars in gold.

VOA: special.2009.02.11

Because it takes three units where there's only four choices at each position to have at least 20 unique combinations.

因为每个位点上仅有四种可能性,只有采用三个碱基一组,才能取得至少二十种不同的组合方式

耶鲁公开课 - 生物医学工程探索课程节选

While there are only four different bases that make up either RNA or DNA, and so the complexity of an RNA polymer is limited.

在RNA或DNA的构成中,只含四种不同的碱基,因此一个RNA分子的复杂程度是有限的

耶鲁公开课 - 生物医学工程探索课程节选

During the museum's 83-year history, there have been only four previous chiefs of the photography department.

WSJ: Snapshot of a Curator | Quentin Bajac | Cultural Conversation by Richard B. Woodward

He struck out seven and walked none, allowing only four singles in seven innings.

WSJ: Mets rally to beat Rivera and Yankees, 2-1

Molins praised the work of French investigators in identifying him in only four days.

CNN: French police arrest suspect in soldier's stabbing