Upper age limit for screening is not yet established.
乳腺癌筛查的年龄上限尚未确定。
So far there has not yet established a mature theory in entrepreneurship research.
创业领域至今还没有形成一个成熟的理论。
One chief reason for this is that the theoretical system of translation knowledge is not yet established or available.
其中的一个重要原因，是翻译教学尚未建立自己的理论知识体系。
One chief reason for this is that the theoretical system of translation knowledge is not yet established or available.
其中的一个重要原因，是翻译教学尚未建立自己的理论知识体系。
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