家系的用法和样例：
例句
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家系从一个祖先传下来的直接世系；家系或家族
Direct descent from an ancestor; lineage or pedigree. -
叔娶嫂制如古希伯来法律规定的弟弟与寡嫂结婚以维持哥哥的家系的一种风俗
The practice of marrying the widow of one's brother to maintain his line, as required by ancient Hebrew law. -
他的家系一直可以追溯到十世纪。
His family can trace its history back to the tenth century.
