名词
中文翻译：Unknown
同义词：
['B-unit', 'B-element', 'B-component例句：1. The new drug has a B-source that is not found in nature.（这种新药有一个自然界中不存在的B-源。）']
例句：
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1. The new drug has a B-source that is not found in nature.
这种新药有一个自然界中不存在的B-源。
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2.The B-source of the energy comes from the sun.
这种能源的B-源来自太阳。
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3.The B-source of the information was lost during the flood.
在洪水中丢失了信息的那个B-源。