In 1952 the preparatory period began.
1952年，预备工程开始了。
The preparatory period is six months.
筹建期为六个月。
This preparatory period (two or even three months, there is no strict rule) is an integral part of your sabbatical, and you must know it.
这一预备期（两个月甚至三个月，对此没有严格规定）是你假期中不可缺少的一部分，你一定要了解这点。
During the ten years of the preparatory period preceding the great movement, this man forms relations with all the crowned heads of Europe.
在准备大规模运动前的十年中，这位领袖人物纠集了欧洲所有头戴王冠的人。
On January 1, 2007, regulations took effect on foreign journalists' reporting activities in China during the Beijing Olympics and the preparatory period.
有关奥运会及其筹备期在中国的外国记者进行报道活动的相关规定已于2007年1月正式实施。
Period of five years (including preparatory six years).
时期五年(含预科共六年)。
The microbial content was higher during preparatory and end periods of operation than during period of progression of operation;
手术准备期与收尾期含菌量高于手术进行期；
The microbial content was higher during preparatory and end periods of operation than during period of progression of operation;
手术准备期与收尾期含菌量高于手术进行期；
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