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如:one grade in the 30s

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如:one grade in the 30s
上下文:
which indicates that there were no grades below 30,one grade in the 30s,one in the 40s,none in the 50s,two in the 60s,three in the 70s,two in the 80s,four in the 90s,and one grade of 100.
没见过这样的句式.30s一般是年代或者岁,这里应该是年代,上世纪30年代