发刊词的英文：
foreword to a periodical

That book has a preface, not a foreword.
那本书有序文，没有前言。

This foreword of the book is writed by a famouse writer .
这本书的序言是由一个著名作家写的。

in his foreword Professor Clark puts it explicitly.
卡拉克教授在他的前言中已经明白地做了介绍。

juvenile period
幼年期(构成中心木质部的一段时期)

But this is a transitional period.
但这是个转变过程。

The period includes the legal period and the period designated by the people's court.
期间包括法定期间和人民法院指定的期间。

We'll call this time period the translation period.
我们称这个时间周期为转化时期。

In this period, the cost would be enormous.
在这期间，就会损失惨重。