问题描述：
下面句子中,should在句首是什么用法?是虚拟语气?如果是虚拟语气的用法还请高手们详细解释一下.
Should the observations or predictions turn out to be as expected,the scientist has added confidence in the probable truth of his hypothesis
Should the observations or predictions turn out to be as expected,the scientist has added confidence in the probable truth of his hypothesis
问题解答：
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