parent-offspring relation的用法和樣例：
例句
- Sometimes just a few individuals that migrate to an island, thus becoming isolated from the parent species, develop into a new species.
有時，正是移居到某一個島上的幾個個體，由於脫離了它們親代，因而發育成為一個新種的。 - Mendel deduced that this result was possible only if each individual possesses only two hereditary units, one from each parent.
只有在每個個體僅擁有兩個研究遺傳單元，並每個單元來自一個親代時，實驗結果才成立。
