第一步

In the first step of thedouble annulation route, 2-amino-3-carbamoyl-5,6-dihydro-4-pyridones 2 werecreated in high to excellent yields by a formal [5C + 1N] annulation reaction ofketene--acetals 1 with ammonia.

第一步，二硫缩烯酮1和氨源通过[5C + 1N]加成反应产率极高的得到了2-氨基-3-氨基甲酰基-5，6-二氢-4-吡啶酮2。

The first step is to improve our appearance.

第一步，是要改善我们的外表。

The first step is to choose a background image of a sky.

第一步，去挑一张天空图片作为背景，我使用了下面的图片。

The first step in manufacturing the pump manifold assembly was to arrange and mount the bilge pump strainers.

第一步，在制造业泵多方面的大会，安排和装载舱底泵

Mechanism of carbon combustion reaction is deduced based on the flame temperature produced by coke burning in bloomery abdomen.

本文根据炼铁高炉炉腹内焦炭燃烧产生的火焰温度推测碳燃烧反应的机理为：第一步，氧气吸收光子形成游离态氧原子，每摩尔氧气吸收 1mol光子；第二步，碳与游离态氧原子作用生成CO ，每生成 1molCO发出 1mol光子；第三步，CO与氧分子作用生成CO2 ，该步骤既不吸收光子，也不发出光子。

You tell us what your pet says and we tell you what your pet is.(neigh = horse, bow-wow = dog, oink = pig, etc).

第一步：在课堂上以动物为主题开始一个讨论。

The first step for me to come out of this was actually to read and learn about BP.

第一步，我要站出来，这其实是阅读和了解血压。

Step 1: Open an image and decide which bit you wish to colorize.

第一步：打开一张你决定使用选择性着色的图像。

The first process is to optimize the geometric parameters of the press, on the assumption that the servomotor rotates at a constant angular velocity equal to that of the constant velocity motor. The second process is to optimize the displacement trajectory of the servomotor based on the results of the first process while keeping the geometric parameter unchangeable.

然后，建立了混合驱动压力机的优化设计模型，并将优化分为两步：第一步，假定伺服电机角速度与常规电机相同的条件下，优化设计出压力机的尺寸参数；第二步，在第一步优化结果的基础上，使机构的尺寸参数不变，优化设计伺服输入运动规律。

Step 1: to confirm that your registered permanent residency belongs to the range of USA consulate general Guangzhou.

第一步：确定你的居住地在广州领事区范围内。

Liapunov—Schmidt method is one of the most important method in the bifurcation theory.

Liapunov—Schmidt方法是分叉理论的最重要方法之一。

Be courteous -- even when people are most discourteous to you .

要有礼貌──即使当別人对你最不礼貌的时候。