occur first

Since crossing over can occur during the first meiotic division, it does allow for some genetic variation in the offspring.

在第一次减数分裂的过程中可以发生交换现象，因而在后代中有遗传变化。

That is in part because this is the first transition in four decades to occur at a time when the United States is at war.

这样做的一个原因是，这是40年来美国首次在和它国交战期间发生权力交接。

Three quarters of all newborn deaths occur in the first week of life.

所有新生儿死亡中有四分之三发生在生命第一周。

Aviation safety studies have shown that approximately 90% of all aviation accidents occur during the first two minutes or the last four minutes of flight.

航空安全研究显示所有的飞行事故中大约有90%都发生在开始两分钟或者最后四分钟的时候。

Technically, this step need not occur first, but it needs to occur early; it should be obvious that you should create the database before any application code, even automatically generated code.

技术上这个步骤不必最先进行，不过需要在早期完成；应该在编写任何应用程序代码（甚至是自动生成的代码）之前创建数据库，这应该是显然的。

α am < α am, Throughout this paper, we assume that the peak values of response occur on the first stroke of the system motion.

本文的基础是所谓首程显峰，假定即系统在速度冲击V下的响应峰值d m和a m出现在第一行程中。

The result showed that the first dates have tended to occur early in the recent half century, and the thermal resources in the farming seasons tended to increase but the temperature conditions have become nonstable in recent years.

结果表明，近半个世纪内，≥7℃、≥10℃初日有逐渐提前的趋势，农业生产季内热量资源有增加趋势，但近些年这些要素较不稳定。

Or services that the process invokes and invoke the process ( where either may occur first).

或者既由流程调用又调用流程的服务（首先出现哪种情况都有可能）。

The "WenBing jiao tone, first by the lung, inverse preach made the WenBing pericardial" is to change laws summary, preach more precisely, it is armour H1N1 flu occur development process in the pathogenesis and preach become the basic theory.

叶天士的温邪上受，首先犯肺，逆传心包是对温病的传变规律的概括，更确切地说，它是甲型H1N1流感发生发展过程中的基本病机和传变学说。

Orion's next flight, also without people aboard, is not expected until 2018, and the first ride for astronauts would not occur until at least 2021.

“猎户座”的下一次非载人飞行任务预计将在2018年进行，它的首次裁人飞行最早也是2021年了。

It says an estimated 37 percent of deaths among children occur in the first month of life, and most in the first week of life.

报告表示，在儿童中，估计有37%的死亡发生在出生后第一个月，大多数在出生后第一星期。

Three misprints occur on the first page.

第一页有三个地方印错。

In the visible light region, the maximal one-photon absorption strengths of the molecules occur in the first excited state.

在低能量范围内，对于D-π-A型分子，分子的单光子吸收强度和双光子吸收截面最大值都发生在分子的第一激发态。

The read-first technique involves refactoring ( or writing) the application logic and workflow so that all processing and read operations occur first, outside of a transaction's scope.

先读取技巧涉及重构（或编写）应用程序逻辑和工作流，以便所有的处理和读取操作在事务作用域的外部首先发生。

The studies on the RCM reaction of this kind of enynes revealed that under the catalysis of the first generation Grubbs catalyst, this kind of enynes could occur RCM reaction successfully under very mild conditions and in the absence of ethylene gas.

研究结果发现：在成本较低的第一代Grubbs催化剂作用下，该类烯炔化合物能够顺利发生关环复分解反应。反应条件温和且无需通入乙烯气体。

Well above two thirds of these deaths, often associated with inappropriate feeding practices, occur during the first year of life.

其中三分之二以上的死亡通常与一岁以前不合理的喂养方式有关。

Shuori solar eclipse will occur in that first day of the Lunar New Year ( New Moon).

日食必发生在朔日，即农历的初一（朔）。

Most infant deaths and hospitalizations now occur in the first two months of life.

现在，因百日咳死亡或住院的婴幼儿大部分发生在头两个月。

Conclusions: In diabetic retinopathy, the changes in vascular morphology occur first, and the expression of growth factor follows.

结论：糖尿病视网膜病变时血管器质性改变在先，而生长因子表达在后。

Many words that occur in the first edition are used in new senses and enter into new compounds.

第一版中的许多词现已用于新义并复合成新词。

Most leaks occur within the first few meters and you may be able to save the camera if you see a leak early enough.

大多数漏水情况就会出现在最初的几米，如果你及时发现漏水，可以尽快挽救你的相机。