名词
中文翻译：Unknown
同义词：
['B-class', 'B-grade例句：1. The movie was rated PG-13', 'which is a B-magnitude rating.（这部电影被评为PG-13，这是一个B级评级。）']
例句：
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1. The movie was rated PG-13, which is a B-magnitude rating.
这部电影被评为PG-13，这是一个B级评级。
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2. In the science class, the teacher gave us a B-magnitude assignment.
在科学课上，老师给我们布置了一个B级作业。
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3.The B-magnitude storms are expected to hit the area tomorrow.
预计明天会有B级风暴袭击该地区。