He has only a rudimentary knowledge of the subject.
对这一科
有
的认识。
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I explain it on two grounds, I replied. In the first place, because vertical currents, which are caused by differences in the water's salinity and density, can produce enough motion to sustain the rudimentary lifestyles of sea lilies and starfish.
用两个理由来解释,
回答,第一,因为那些上下垂直往来的水流,由海水的不同咸
和不同密
决定,发生一种运动,足以维持海百合和海
一类的原始基本生活。
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