occur first的例句大全

What causes these genetic mix-ups to occur in the first place?

是什么首先引起这些基因混乱的 呢 ?

Based on the author's experience and understanding, this paper first analyses the errors that normally occur in library cataloguing and their causes and then proposes a number of countermeasures.

文章结合作者工作经验与体会，分析了图书分类工作存在的常见错误及产生的原因，并提出了相应的改进措施。

The author first states the problems occur in the English study among the junior middle school students.

第一章为问题的提出，主要是讲述目前初中生在英语学习上出现的问题。

First of all, it introduces some related concepts and terminologies, and analyses sports events where injuries might occur, and the frequency and types of these occurrences;

本文首先分析了大学生体育运动伤害事故中的一些基本概念，通过问卷，调查了其发生的体育项目、发生的频数、活动类型。