「备胎」とは？
1 個の語義
感情生活中的后备选择，有点好感但是又不想成为正式情人的对象。就像车里的备胎一样，只要不出意外一般不用，真出了意外也就临时用一下。
ENA backup choice in a romantic relationship, someone you have some feelings for but don't want to be a formal lover with. Just like a spare tire in a car, you don't usually use it unless something unexpected happens, and even then, you only use it temporarily.
电脑修得好，备胎当到老。