缩短重复元素和伪类组合的冗长 CSS

我将不同的伪类和元素添加到表的相同部分。有没有办法通过某种方式总结来节省工作和精力？我不知道该怎么做。

.tr1 th:nth-child(1) {background-color: green;}
.tr1 th:nth-child(5) {background-color: green;}
.tr2 td:nth-child(2) {background-color: green;}
.tr2 td:nth-child(4) {background-color: green;}
.tr3 td:nth-child(3) {background-color: green;}
.tr4 td:nth-child(4) {background-color: green;}
.tr4 td:nth-child(2) {background-color: green;}

.tr1 th:nth-child(1):hover {background-color: hotpink;}
.tr1 th:nth-child(5):hover {background-color: hotpink;}
.tr2 td:nth-child(2):hover {background-color: hotpink;}
.tr2 td:nth-child(4):hover {background-color: hotpink;}
.tr3 td:nth-child(3):hover {background-color: hotpink;}
.tr4 td:nth-child(4):hover {background-color: hotpink;}
.tr4 td:nth-child(2):hover {background-color: hotpink;}

.tr1 th:nth-child(1)::selection {color: hotpink;}
.tr1 th:nth-child(5)::selection {color: hotpink;}
.tr2 td:nth-child(2)::selection {color: hotpink;}
.tr2 td:nth-child(4)::selection {color: hotpink;}
.tr3 td:nth-child(3)::selection {color: hotpink;}
.tr4 td:nth-child(4)::selection {color: hotpink;}
.tr4 td:nth-child(2)::selection {color: hotpink;}

您可以使用组合选择器:is()和逗号,

.tr1 th:is(:nth-child(1),:nth-child(5)),
:is(.tr2,.tr4) td:is(:nth-child(2),:nth-child(4)),
.tr3 td:nth-child(3) {background-color:green}

.tr1 th:is(:nth-child(1),:nth-child(5)):hover,
:is(.tr2,.tr4) td:is(:nth-child(2),:nth-child(4)):hover,
.tr3 td:nth-child(3):hover {background-color:hotpink}

.tr1 th:is(:nth-child(1),:nth-child(5))::selection,
:is(.tr2,.tr4) td:is(:nth-child(2),:nth-child(4))::selection,
.tr3 td:nth-child(3)::selection {color:hotpink}