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Extraterrestrial life represents an enormous gap in our knowledge of nature.
外空是否存在生命，这是我们对自然认识的空白。
youdao
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He helped us to fill in a big gap (in our knowledge).
他帮我们填满知识上的空白。
youdao
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He helped us to fill in a big gap in our knowledge.
他帮我们填补知识上的空白。
youdao
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He helped us to fill in a big gap in our knowledge.
他帮我们填补知识上的空白。
youdao