我首先需要说的是：谢菲尔德市的人民一致欢迎从中国来到我们大学的年轻人，这一点不会改变。
The first thing I need to say is that the people in Sheffield are united in their welcome for young people who come to our university from China, and this will not change.
首先需要说明的是，“熔化”并不是什么精确定义的专业术语，在用来衡量反应堆状况时，这个词显得相当无用。
First of all, a "meltdown" is not a precisely defined term, which makes it fairly useless as an indicator of what's going on.
但首先需要说明的，我认为是这个。
But the very first point that needs to be made, I think, is this.
首先需要说明的是，本文的对象主要是针对那些本科生和研究生。好了，下面我们就开始正题。
At first, is should be noted that the objects of this article mainly aim at the undergraduates and graduates, respectively. Ok, let's begin our business.
首先需要说明的是，本文的对象主要是针对那些本科生和研究生。好了，下面我们就开始正题。
At first, is should be noted that the objects of this article mainly aim at the undergraduates and graduates, respectively. Ok, let's begin our business.
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