There existed a definite amount of SRB in the deep aquatic environment.
阿哈湖深层水体中有一定数量的硫酸盐还原菌存在。
He went on to explain, "if I came every day to give them a definite amount of water, the saplings would get used to it and rely on it."
他继续解释，“如果我每天去树园给他们定量的水分，不久，树苗便会习惯于、依赖于如此。”
The field of force associated with electric charge in motion, having both electric and magnetic components and containing a definite amount of electromagnetic energy.
由运动电荷产生的力场，由电和磁西部分构成，具有确定的电磁能量。
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