化学反应不能将元素分解成更小的单位。元素只含有一种原子。
An element cannot be broken down into simpler units by chemical reactions; it contains only one kind of atom.
书写单位；书写符号代表一个元音、辅音、音节、词或其它表达方式，并且不能进一步分解的书写符号。
A written character that represents a vowel, consonant, syllable, word, or other expression and that cannot be further analyzed.
用单位时间的相对耗氧摩尔数来反应呼吸速率的快慢，而用呼吸商来反应呼吸过程中代谢燃料的分解途径。
The respiratory rate and catabolism pathway are described respectively by using relative mol number of consumed oxygen during unit time and respiratory quotient.
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