以前

This important step in the development of the body plan is known to involve the Notch signalling pathway, which regulates expression of the Nodal gene.

以前的研究认为Notch信号中的Nodal 基因和胞浆内自由钙是主要决定因素，最新的研究显示细胞外钙也是重要的因素，它能被Notch信号感受，并表达不同的基因。

Thanks to effective lag management and using a different weapon, the author has achieved 85 seconds worth of improvement over the previous movie by Walker Boh.

有效的感谢和落后的管理使用不同的武器，作者取得了沃克谟由以前的电影85秒的改善价值。

I had the big door sheathed with boiler iron two weeks ago, and triple-locked-and I've got the keys.

我已经在两个星期以前用锅炉铁板把大门钉上了一层，并且上了三道锁--钥匙在我手里哪。

Bold-faced. Since the introduction of the computer, type design has become available to a wide audience like never shown before in history.

计算机的普及，使得广大的用户得以接触到字体设计，这在以前是从未有过的。

Bold-faced .Since the introduction of the computer, type design has becomeavailable to a wide audience like never shown before in history.

计算机的普及，使得广大的用户得以接触到字体设计，这在以前是从未有过的。

Bold-faced.

计算机的普及，使得广大的用户得以接触到字体设计，这在以前是从未有过的。

After the boll weevil infestation, urban Black workers faced competition from the continuing influx of both Black and White rural workers, who were driven to undercut the wages formerly paid for industrial jobs.

棉铃虫害之后，城市黑人工人面临了来自黑人和白人工人持续涌入的竞争，后者被迫削减以前所从事工作的工资。

Prior to 1924, the Bolshevik's international perspective had been guided by Trotsky's position.

而在1924年以前，布尔什维克的国际观一直由托洛茨基的立场所左右。

To explain the time-resolved fluorescence depletion, we develop a dynamics theory of spectroscopy for a vibrational relaxation process, and a decay rate constant of the vibrational state on the excited electronic state is taken to be 〓〓 in which γ is vibrational relaxation rate constant of the transition 0→1 and k〓 is the Boltzmann constant.

电子激发态上的波函数可写作〓相比于以前密度矩阵理论的布居表象，本文所提出的波函数表象理论为在更本质的层次上揭示振动弛豫过程的物理图象，特别是研究超短脉冲激发下含有振动弛豫的动力学光谱创造了条件。

The previous three aircraft were all fighters, but the Avenger is a bomber, carrying either regular bombs or a torpedo in the bomb bay you can see being demonstrated in this shot.

以前的三架飞机是所有战士的，但复仇者是一个炸弹，或者经常携带炸弹或鱼雷的炸弹湾您可以看到所演示的这个镜头。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。