This change has occurred in a period of fast population growth among low-income families.
而且这一变化发生于低收入家庭人口迅速膨胀的时期。
If you want to work as fast as you can, you want to work with clean code. Period.
如果你想尽可能快地工作，就需要编写干净整洁的代码。
Another episode of this period of my early boyhood is held fast in my mind.
我童年时还有一段插曲，在我心里记得很牢。
Young people go through a period of fast growth, called puberty.
青少年会经历一段快速成长期，称为青春期。
Fast means not to eat food for a period of time.
“斋戒”意思是有一段时间不吃食物。
The invention has simple, fast and effective test method, low cost and short research and development period.
本发明具有试验方法简单、快速、有效，且成本低、研发周期短的特点。
The second period is the fast growing period.
第二阶段是高速成长期。
The second period is the fast growing period.
第二阶段是高速成长期。
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