"不上不下"是个多义词，它可以指不上不下（成语）,不上不下（若初网小说）。
此刻，气温高达华氏90度，我正坐在中城区一家酒店叫人透不过气的客房里，置身于通风井不上不下的位置。
I am sitting at the moment in a stifling hotel room in 90-degree heat, halfway down an air shaft, in midtown.
有一整个学年，我儿子的成绩表现一直不上不下，数学方面如此，甚至还有英语，看起来似乎每一门课都是如此。
There was an entire elementary school year in which my son got consistently mediocre grades in math, in English, in everything, it seemed.
如果考虑成本问题不能具备此等高端的EDXRF，那么，根据对比测试，国产的EDXRF也可以是替代的选择，不上不下的日产EDXRF在整体性能上并不比之高出多少。
If limited by the high cost, then, according with the comparison, the homemade EDXRF also can be the replaceable choice, as the JapanMade's performance is not better than it.
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