Silence. Tommy has finished his story. Red is stunned. But Andy looks like he's been smacked with a two by four.

寂静。汤米说完了他的故事，瑞德怔在那里，安迪却像没事人似的。

youdao

Analysis by gel electrophoresis revealed slight differences in amino acid sequence of the enzymes of two of the four pairs.

经凝胶电泳分析，发现四对实验对象中有两对的酶的氨基酸序列略有差异。

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Quartz is quartz—a silicon ion surrounded by four oxygen ions—there's no difference at all between two-million-year-old Pleistocene quartz and Cambrian quartz created over 500 million years ago.

石英是石英——由四个氧离子围绕的硅离子——200万年前的更新世石英和5亿年前的寒武纪石英之间没有任何区别。

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For example, areas with mangrove forests were not damaged as badly by the Indian Ocean tsunami in two thousand four.

VOA: special.2010.04.20

I've got two states here, three states here, two here, I need four, and if I can come up with these bonds, four, by the Hund rule I'd fill them like this.

我们已经有2个状态在这里，3个在这里，2个在这里，我需要4个，如果我能想到这些键，四个，通过洪特规则，我们就能像这样排布。

麻省理工公开课 - 固态化学导论课程节选

1 So, it's two times 3.12 plus four times 1.31, 6 all divided by six.

就是2*3。12+4*1。,最后再除以。

麻省理工公开课 - 固态化学导论课程节选

If the carbon tax was not the proverbial hit over the head with a two by four, I would come out behind.

FORBES: Is A Vote For Jill Stein A Vote For Higher Prices At The Pump ?

In a speech this morning at the National Press Club, AFL-CIO president Richard Trumka issued a less than veiled threat to Democrats, suggesting that those politicians who have stood by while the GOP has taken a two by four to the American union movement better not expect their phone calls to be answered come campaign season.

FORBES: Unions To National Democratic Politicians: Who Needs You?

He won two big prizes that eluded the Democrats in 2000 and 2004: Florida (by two points) and Ohio (by four).

ECONOMIST: The presidency